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HTML 

              
                <main class="main">
    <div class="mainWrapper">
        <div class="mainBackground clearfix">
            <div class="row">
                <div class="column small-centered">
                    <div class="productCard_block">
                        <div class="row">
                            <div class="small-12 large-6 columns">
                                <div class="productCard_leftSide clearfix">
                                    <div class="productCard_brendBlock">
                                        <a class="productCard_brendBlock__imageBlock" href="#">
                                            <img src="https://github.com/BlackStar1991/CardProduct/blob/master/app/img/brtendsLogos/logo_sennheiser.png?raw=true" alt="sennheiser">
                                        </a>
                                    </div>

                                    <div class="sliderBlock">
                                        <ul class="sliderBlock_items">
                                            <li class="sliderBlock_items__itemPhoto sliderBlock_items__showing">
                                                <img src="https://github.com/BlackStar1991/CardProduct/blob/master/app/img/goods/item1/phones1.png?raw=true" alt="headphones">
                                            </li>
                                            <li class="sliderBlock_items__itemPhoto">
                                                <img src="https://github.com/BlackStar1991/CardProduct/blob/master/app/img/goods/item1/phones2.png?raw=true"  alt="headphones">
                                            </li>
                                            <li class="sliderBlock_items__itemPhoto">
                                                <img src="https://github.com/BlackStar1991/CardProduct/blob/master/app/img/goods/item1/phones3.png?raw=true"  alt="headphones">
                                            </li>
                                            <li class="sliderBlock_items__itemPhoto">
                                                <img src="https://github.com/BlackStar1991/CardProduct/blob/master/app/img/goods/item1/phones4.png?raw=true"  alt="headphones">
                                            </li>
                                            <li class="sliderBlock_items__itemPhoto">
                                                <img src="https://github.com/BlackStar1991/CardProduct/blob/master/app/img/goods/item1/phones5.png?raw=true"  alt="headphones">
                                            </li>
                                        </ul>

                                        
                                        <div class="sliderBlock_controls">
                                            <div class="sliderBlock_controls__navigatin">
                                                <div class="sliderBlock_controls__wrapper">
                                                    <div class="sliderBlock_controls__arrow sliderBlock_controls__arrowBackward">
                                                        <i class="fa fa-angle-left" aria-hidden="true"></i>
                                                    </div>
                                                    <div class="sliderBlock_controls__arrow sliderBlock_controls__arrowForward">
                                                        <i class="fa fa-angle-right" aria-hidden="true"></i>
                                                    </div>
                                                </div>
                                            </div>

                                            <ul class="sliderBlock_positionControls">
                                                <li class="sliderBlock_positionControls__paginatorItem sliderBlock_positionControls__active"></li>
                                                <li class="sliderBlock_positionControls__paginatorItem"></li>
                                                <li class="sliderBlock_positionControls__paginatorItem"></li>
                                                <li class="sliderBlock_positionControls__paginatorItem"></li>
                                                <li class="sliderBlock_positionControls__paginatorItem"></li>
                                            </ul>
                                        </div>
                                    </div>
                                </div>
                            </div>
                            <div class="small-12 large-6 columns">
                                <div class="productCard_rightSide">
                                    <div class="block_specification">
                                        <div class="block_specification__specificationShow">
                                            <i class="fa fa-cog block_specification__button block_specification__button__rotate"
                                               aria-hidden="true"></i>
                                            <span class="block_specification__text">spec</span>
                                        </div>
                                        <div class="block_specification__informationShow hide">
                                            <i class="fa fa-info-circle block_specification__button block_specification__button__jump"
                                               aria-hidden="true"></i>
                                            <span class="block_specification__text">inform</span>
                                        </div>
                                    </div>

                                    <p class="block_model">
                                        <span class="block_model__text">Model: </span>
                                        <span class="block_model__number">505795</span>
                                    </p>

                                    <div class="block_product">
                                        <h2 class="block_name block_name__mainName">MOMENTUM<sup>&reg; </sup></h2>
                                        <h2 class="block_name block_name__addName">Wireless Black</h2>

                                        <p class="block_product__advantagesProduct">
                                            Wireless headphones with integrated microphone
                                        </p>

                                        <div class="block_informationAboutDevice">

                                            <div class="block_descriptionCharacteristic block_descriptionCharacteristic__disActive">
                                                <table class="block_specificationInformation_table">
                                                    <tr>
                                                        <th>Characteristic</th>
                                                        <th>Value</th>
                                                    </tr>
                                                    <tr>
                                                        <td>Ear Coupling</td>
                                                        <td>Around Ear</td>
                                                    </tr>
                                                    <tr>
                                                        <td>Transducer Principle</td>
                                                        <td>Dynamic, Closed-back</td>
                                                    </tr>
                                                    <tr>
                                                        <td>Frequency Response</td>
                                                        <td>16Hz – 22kHz</td>
                                                    </tr>
                                                    <tr>
                                                        <td>Sound Pressure Level (SPL)</td>
                                                        <td>113 dB (Passive: 1 kHz/1 Vrms)</td>
                                                    </tr>
                                                    <tr>
                                                        <td>Total Harmonic Distortion (THD)</td>
                                                        <td>&lt;0.5% (1 kHz, 100 dB SPL)</td>
                                                    </tr>
                                                    <tr>
                                                        <td>Volume Control</td>
                                                        <td>Earcup control when Bluetooth connected</td>
                                                    </tr>
                                                    <tr>
                                                        <td>Microphone Type</td>
                                                        <td>Dual omni-directional microphone <br>(2 mic beam forming
                                                            array)
                                                        </td>
                                                    </tr>
                                                    <tr>
                                                        <td>Cable / Connector</td>
                                                        <td>1.4m (Detachable) / 3.5mm Angled</td>
                                                    </tr>
                                                    <tr>
                                                        <td>Weight</td>
                                                        <td>260g (9.17 oz)</td>
                                                    </tr>
                                                </table>
                                            </div>


                                            <div class="block_descriptionInformation">
                                                <span>Peak performance with active noise cancelation. Sennheiser's new MOMENTUM Wireless
                                                - Closed circumauralheadphone featuring <a class="block_product__link"
                                                                                           href="#">Bluetooth<sup>&reg;</sup></a>  wireless technology and NoiseGard Hybrid active noise cancelation
                                                </span>
                                            </div>

                                            <div class="block_rating clearfix">
                                                <fieldset class="block_rating__stars">
                                                    <input type="radio" id="star5" name="rating" value="5"/><label
                                                        class="full" for="star5" title="Awesome - 5 stars"></label>
                                                    <input type="radio" id="star4half" name="rating"
                                                           value="4 and a half"/><label class="half" for="star4half"
                                                                                        title="Pretty good - 4.5 stars"></label>
                                                    <input type="radio" id="star4" name="rating" value="4"/><label
                                                        class="full" for="star4" title="Good - 4 stars"></label>
                                                    <input type="radio" id="star3half" name="rating"
                                                           value="3 and a half"/><label class="half" for="star3half"
                                                                                        title="Above average - 3.5 stars"></label>
                                                    <input type="radio" id="star3" name="rating" value="3"/><label
                                                        class="full" for="star3" title="Average - 3 stars"></label>
                                                    <input type="radio" id="star2half" name="rating"
                                                           value="2 and a half"/><label class="half" for="star2half"
                                                                                        title="Kinda bad - 2.5 stars"></label>
                                                    <input type="radio" id="star2" name="rating" value="2"/><label
                                                        class="full" for="star2"
                                                        title="Kinda bad - 2 stars"></label>
                                                    <input type="radio" id="star1half" name="rating"
                                                           value="1 and a half"/><label class="half" for="star1half"
                                                                                        title="Meh - 1.5 stars"></label>
                                                    <input type="radio" id="star1" name="rating" value="1"/><label
                                                        class="full" for="star1"
                                                        title="Sucks big time - 1 star"></label>
                                                    <input type="radio" id="starhalf" name="rating"
                                                           value="half"/><label
                                                        class="half" for="starhalf"
                                                        title="Sucks big time - 0.5 stars"></label>
                                                </fieldset>

                                                <span class="block_rating__avarage">4.25</span>
                                                <span class="block_rating__reviews">(153 reviews)</span>

                                            </div>
                                            <div class="row ">
                                                <div class="large-6 small-12 column left-align">
                                                    <div class="block_price">
                                                        <p class="block_price__currency">$499.95</p>
                                                        <p class="block_price__shipping">Shipping and taxes extra</p>
                                                    </div>
                                                    <div class="block_quantity clearfix">
                                                        <span class="text_specification">Quantity</span>
                                                        <div class="block_quantity__chooseBlock">
                                                            <input class="block_quantity__number" name="quantityNumber"
                                                                   type="text" min="1" value="1">
                                                            <button class="block_quantity__button block_quantity__up"></button>
                                                            <button class="block_quantity__button block_quantity__down"></button>
                                                        </div>
                                                    </div>
                                                </div>
         <div class="large-6 small-12 column end">
                                                    <div class="block_goodColor">
                                                        <span class="text_specification">Choose your colors:</span>
                                                        <div class="block_goodColor__allColors">
                                                            <input type="radio" name="colorOfItem" class="radio_button"
                                                                   id="radioColor" checked/>
                                                            <label for="radioColor"
                                                                   class="block_goodColor__radio block_goodColor__black"></label>
                                                            <input type="radio" name="colorOfItem" class="radio_button"
                                                                   id="radioColor2"/>
                                                            <label for="radioColor2"
                                                                   class="block_goodColor__radio block_goodColor__silver"></label>
                                                        </div>
                                                    </div>
                                                    <button class="button button_addToCard">
                                                        Add to Cart
                                                    </button>
                                                </div>
                                  
                                            </div>
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>

</main>

<div class="aboutMe">
<a href="https://codepen.io/BlackStar1991/pens/public/" target="_new">
    <i class='fa fa-codepen'></i> my other Pens</a>
</div>
!

CSS 

              
                /*********************************************/
/*COLORS*/
/*********************************************/
body {
  font-family: "Titillium Web", sans-serif;
  font-weight: 400;
  font-size: 14px;
  min-width: 320px;
  position: relative;
}

img {
  max-width: 100%;
  height: auto;
}

ul {
  margin: 0;
  padding: 0;
  list-style-type: none !important;
}

a {
  text-decoration: none;
  color: black;
}
a:hover, a:focus, a:active {
  text-decoration: none;
  color: black;
}

input,
input:focus,
input:active {
  outline: none;
}

button,
button:active,
button:focus,
button:hover {
  outline: none;
}

button {
  padding: 0;
  margin: 0;
  background-color: transparent;
  color: #000;
}

.mainWrapper {
  position: relative;
  width: 100%;
  min-width: 320px;
  min-height: 1000px;
  padding: 0;
  margin: 0 !important;
  background: radial-gradient(rgb(48, 61, 85), rgb(47, 51, 82));
}

.wrappen_block {
  position: relative;
  width: 100%;
  height: 100%;
}

.mainBackground {
  width: 100%;
  min-height: 1000px;
  background: url("https://github.com/BlackStar1991/CardProduct/blob/master/app/img/bgRectangl.png?raw=true") left center no-repeat, url("https://github.com/BlackStar1991/CardProduct/blob/master/app/img/bgPhons.png?raw=true") center center no-repeat, url("https://github.com/BlackStar1991/CardProduct/blob/master/app/img/layer-3-copy-2.png?raw=true") center center no-repeat, url("https://github.com/BlackStar1991/CardProduct/blob/master/app/img/mainBg.png?raw=true") center center no-repeat;
}

.productCard_block {
  position: relative;
  margin: 190px auto 0;
  max-width: 800px;
  min-height: 600px;
  box-shadow: 0 5px 21px rgba(0, 0, 0, 0.08);
  background-color: #fff;
}

/* LEFT SIDE */
.productCard_leftSide {
  position: relative;
  width: 100%;
  min-height: 600px;
}

.productCard_brendBlock {
  width: 100%;
  height: 75px;
  position: absolute;
  top: 0;
  left: 0;
  max-width: 184px;
  max-height: 75px;
  background-color: #272727;
  z-index: 2;
}
.productCard_brendBlock__imageBlock {
  display: block;
  height: 100%;
}
.productCard_brendBlock__imageBlock img {
  position: absolute;
  display: block;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.sliderBlock {
  position: relative;
  height: 100%;
  margin-left: 70px;
  margin-top: 89px;
  margin-bottom: 46px;
  overflow: hidden;
}

.sliderBlock_items {
  position: relative;
  display: block;
  width: 100%;
  height: 403px;
}
.sliderBlock_items__itemPhoto {
  position: absolute;
  width: 100%;
  height: 100%;
  opacity: 0;
  z-index: 2;
  transition: opacity 1s;
}
.sliderBlock_items__showing {
  opacity: 1;
  z-index: 3;
}
.sliderBlock_items:after {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background: url("https://github.com/BlackStar1991/CardProduct/blob/master/app/img/decorElements/DecorRectangle.png") 50% 50% no-repeat;
  opacity: 0.2;
  z-index: 4;
}

.sliderBlock_controls {
  width: 100%;
}
.sliderBlock_controls__navigatin {
  margin-top: 8px;
  width: 100%;
}
.sliderBlock_controls__wrapper {
  margin: 1% auto;
  width: 110px;
  height: 20px;
}
.sliderBlock_controls__arrow {
  position: relative;
  width: 24px;
  height: 24px;
  cursor: pointer;
  border: 1px solid #536dfe;
  transition: 300ms all;
  background-color: #0d2660;
  border-radius: 50%;
}
.sliderBlock_controls__arrow:hover {
  background-color: #536dfe;
}
.sliderBlock_controls__arrow i {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 50%;
  left: 50%;
  margin-left: -50%;
  margin-top: -50%;
  color: #fff;
  transition: 300ms all;
  font-weight: bold;
  text-align: center;
  font-size: 20px;
}
.sliderBlock_controls__arrowBackward {
  float: left;
}
.sliderBlock_controls__arrowForward {
  float: right;
}

.sliderBlock_positionControls {
  display: block;
  width: 100%;
  height: 3px;
  margin: 30px auto 0;
}
.sliderBlock_positionControls__paginatorItem {
  float: left;
  width: 18px;
  height: 10px;
  margin-left: 5px;
  background-color: #d7d7d7;
  cursor: pointer;
}
.sliderBlock_positionControls__paginatorItem:first-child {
  margin-left: 31%;
}
.sliderBlock_positionControls__active {
  background-color: #536dfe;
}

/*   RIGHT SIDE */
.productCard_rightSide {
  position: relative;
  padding-top: 34px;
  padding-left: 27px;
  padding-right: 40px;
  width: 100%;
  min-height: 600px;
}

.block_specification {
  float: right;
  margin-top: 8px;
  cursor: pointer;
  color: #536dfe;
  transition: all 0.5s;
}
.block_specification__button {
  display: inline-block;
  margin-right: 7px;
  height: 100%;
  font-size: 17px;
  text-transform: uppercase;
  transform: rotate(0);
  transition: transform 0.5s;
  transform-origin: center center;
}
.block_specification:hover .block_specification__button__rotate {
  transition: transform 0.5s;
  transform: rotate(1turn);
}
.block_specification:hover {
  color: #f1425d;
}

.block_specification__text {
  width: 30px;
  height: 11px;
  font-family: "Titillium Web", sans-serif;
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
}

.block_model {
  display: inline-block;
  color: #263238;
  font-size: 12px;
  opacity: 0.9;
}

.block_name {
  width: 100%;
  color: #263238;
  font-weight: 400;
  line-height: 35px;
}
.block_name__mainName {
  margin: 0;
  padding: 0;
  font-size: 29px;
}
.block_name__addName {
  margin: 0;
  padding: 0;
  font-size: 24px;
}

.block_product {
  position: relative;
  width: 100%;
}
.block_product__advantagesProduct {
  width: 271px;
  height: 41px;
  margin-top: 14px;
  color: #646b6f;
  font-size: 17px;
  line-height: 24px;
}
.block_product__link {
  line-height: 23px;
  color: #536dfe;
}

.block_informationAboutDevice {
  position: relative;
  width: 100%;
  overflow: hidden;
}

.block_descriptionInformation {
  width: 304px;
  height: 104px;
  margin-top: 10px;
  font-size: 14px;
  font-weight: 400;
  line-height: 23px;
  color: #263238;
}

.block_descriptionCharacteristic {
  position: absolute;
  top: 0;
  left: 100%;
  width: 100%;
  height: 100%;
  z-index: 30;
  transition: left, ease-out, 0.5s;
}
.block_descriptionCharacteristic__active {
  left: 0;
}

@keyframes moveCharackeristic {
  0% {
    left: 100%;
  }
  100% {
    left: 0;
  }
}
.block_specificationInformation_table {
  position: relative;
  height: 90%;
  background-color: #fff;
}
.block_specificationInformation_table tr {
  border-collapse: collapse;
  border: 1px solid #000;
}
.block_specificationInformation_table th {
  border: 1px solid #000;
  font-weight: bold;
}
.block_specificationInformation_table td {
  border-collapse: collapse;
  text-align: center;
  border: 1px solid #000;
}

.block_rating {
  width: 100%;
  margin-top: 33px;
}

fieldset,
label {
  margin: 0;
  padding: 0;
}

.block_rating__stars {
  border: none;
  float: left;
  width: auto;
  margin: 0;
  padding: 0;
}

input[type=checkbox] + label,
input[type=radio] + label {
  margin: 0;
}

.block_rating__stars > input {
  display: none;
}

.block_rating__stars > label:before {
  margin: 5px;
  font-size: 15px;
  font-family: "FontAwesome";
  display: inline-block;
  content: "\f005";
}

.block_rating__stars > .half:before {
  content: "\f089";
  position: absolute;
}

.block_rating__stars > label {
  color: #c9c9c9;
  float: right;
}

/***** CSS Magic to Highlight Stars on Hover *****/
.block_rating__stars > input:checked ~ label,
.block_rating__stars:not(:checked) > label:hover,
.block_rating__stars:not(:checked) > label:hover ~ label {
  color: #fccf47;
}

/* hover previous stars in list */
.block_rating__stars > input:checked + label:hover,
.block_rating__stars > input:checked ~ label:hover,
.block_rating__stars > label:hover ~ input:checked ~ label,
.block_rating__stars > input:checked ~ label:hover ~ label {
  color: #ffed85;
}

.block_rating__avarage {
  margin-left: 31px;
  color: #f1425d;
  font-size: 15px;
  line-height: 35px;
}

.block_rating__reviews {
  margin-left: 6px;
  color: #656c6f;
  font-size: 13px;
}

.block_price {
  margin-top: 29px;
  width: 100%;
}
.block_price__currency {
  padding: 0;
  margin: 0;
  vertical-align: top;
  color: #f1425d;
  font-size: 26px;
  font-weight: 600;
}
.block_price__shipping {
  padding: 0;
  margin: 0;
  color: #a2a9ad;
  font-size: 12px;
}

.radio_button {
  position: absolute;
  opacity: 0;
}

.block_goodColor {
  margin-top: 29px;
  width: 100%;
}
.block_goodColor__allColors {
  width: 100%;
  margin-top: 14px;
}
.block_goodColor__radio {
  display: inline-block;
  width: 21px;
  height: 21px;
  border-radius: 50%;
  margin-left: 10% !important;
  background-color: #e8e6e3;
  cursor: pointer;
}

.radio_button:checked + .block_goodColor__radio {
  width: 25px;
  height: 25px;
  box-shadow: 0 0 5px 3px rgba(83, 109, 254, 0.5);
  border: 2px solid #fff;
}

.block_goodColor__black {
  background-color: #3c383a;
}

.block_goodColor__silver {
  background-color: silver;
}

.text_specification {
  padding: 0;
  color: #37474f;
  font-size: 13px;
}

.block_quantity {
  position: relative;
  height: 46px;
  margin-top: 45px;
}
.block_quantity span {
  display: inline-block;
  float: left;
  margin-top: 15px;
  margin-right: 10px;
}
.block_quantity__chooseBlock {
  vertical-align: top;
  height: 100%;
  margin: 0;
  padding: 0;
}
.block_quantity__number {
  display: inline-block;
  float: left;
  width: 52px;
  height: 46px;
  border: 1px solid #ddd;
  font-size: 18px;
}
.block_quantity__number::placeholder {
  color: #403f40;
  font-size: 18px;
  line-height: 35px;
}
.block_quantity__button {
  display: inline-block;
  position: relative;
  float: left;
  width: 20px;
  height: 50%;
  margin: 0;
  padding: 0;
  margin-left: 11px;
  font-size: 0;
  cursor: pointer;
}
.block_quantity__button:hover, .block_quantity__button:focus {
  background-color: transparent;
}
.block_quantity__button:hover:before, .block_quantity__button:focus:before {
  color: #536dfe;
}
.block_quantity__up:before {
  content: "\f106";
  width: 11px;
  height: 6px;
  font-family: "FontAwesome";
  color: #37474f;
  font-size: 18px;
}
.block_quantity__down:before {
  content: "\f107";
  width: 11px;
  height: 6px;
  font-family: "FontAwesome";
  color: #37474f;
  font-size: 18px;
}

.button.button_addToCard {
  width: 147px;
  height: 46px;
  margin-top: 43px;
  margin-bottom: 0;
  padding: 0;
  color: #fff;
  background-color: #536dfe;
  font-size: 17px;
  transition: all 0.3s;
}
.button.button_addToCard:hover {
  background-color: #0d2660;
}

.aboutMe a {
  display: block;
  width: 30%;
  position: fixed;
  bottom: 0.1%;
  left: 20px;
  color: rgba(255, 255, 255, 0.6);
  font-size: 1.5em;
  font-family: "Roboto", sans-serif;
  text-decoration: none;
}
!

JS 

              
                
/*
I want to thank Paul Rudnitskiy for his idea.
If you need full work version you can download it here  https://github.com/BlackStar1991/CardProduct
*/



window.onload = function () {

    //// SLIDER
    var slider = document.getElementsByClassName("sliderBlock_items");
    var slides = document.getElementsByClassName("sliderBlock_items__itemPhoto");
    var next = document.getElementsByClassName("sliderBlock_controls__arrowForward")[0];
    var previous = document.getElementsByClassName("sliderBlock_controls__arrowBackward")[0];
    var items = document.getElementsByClassName("sliderBlock_positionControls")[0];
    var currentSlideItem = document.getElementsByClassName("sliderBlock_positionControls__paginatorItem");

    var currentSlide = 0;
    var slideInterval = setInterval(nextSlide, 5000);  /// Delay time of slides

    function nextSlide() {
        goToSlide(currentSlide + 1);
    }

    function previousSlide() {
        goToSlide(currentSlide - 1);
    }


    function goToSlide(n) {
        slides[currentSlide].className = 'sliderBlock_items__itemPhoto';
        items.children[currentSlide].className = 'sliderBlock_positionControls__paginatorItem';
        currentSlide = (n + slides.length) % slides.length;
        slides[currentSlide].className = 'sliderBlock_items__itemPhoto sliderBlock_items__showing';
        items.children[currentSlide].className = 'sliderBlock_positionControls__paginatorItem sliderBlock_positionControls__active';
    }


    next.onclick = function () {
        nextSlide();
    };
    previous.onclick = function () {
        previousSlide();
    };


    function goToSlideAfterPushTheMiniBlock() {
        for (var i = 0; i < currentSlideItem.length; i++) {
            currentSlideItem[i].onclick = function (i) {
                var index = Array.prototype.indexOf.call(currentSlideItem, this);
                goToSlide(index);
            }
        }
    }

    goToSlideAfterPushTheMiniBlock();


/////////////////////////////////////////////////////////

///// Specification Field


    var buttonFullSpecification = document.getElementsByClassName("block_specification")[0];
    var buttonSpecification = document.getElementsByClassName("block_specification__specificationShow")[0];
    var buttonInformation = document.getElementsByClassName("block_specification__informationShow")[0];

    var blockCharacteristiic = document.querySelector(".block_descriptionCharacteristic");
    var activeCharacteristic = document.querySelector(".block_descriptionCharacteristic__active");


    buttonFullSpecification.onclick = function () {

        console.log("OK");


        buttonSpecification.classList.toggle("hide");
        buttonInformation.classList.toggle("hide");


        blockCharacteristiic.classList.toggle("block_descriptionCharacteristic__active");


    };


/////  QUANTITY ITEMS

    var up = document.getElementsByClassName('block_quantity__up')[0],
        down = document.getElementsByClassName('block_quantity__down')[0],
        input = document.getElementsByClassName('block_quantity__number')[0];

    function getValue() {
        return parseInt(input.value);
    }

    up.onclick = function (event) {
        input.value = getValue() + 1;
    };
    down.onclick = function (event) {
        if (input.value <= 1) {
            return 1;
        } else {
            input.value = getValue() - 1;
        }

    }


};
!
999px

Console