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CSS

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HTML 

              
                  <div class="row">
                    <div class="col-1-of-3">
                        <div class="card">
                             <div class="card__side card__side--front">
                                 <div class="card__picture card__picture--1">
                                     &nbsp;
                                 </div>
                                 <h4 class="card__heading">
                                     <span class="card__heading-span card__heading-span--1">single player</span>
                                 </h4>
                                 <div class="card__details">
                                    <ul>
                                        <li>&#x2714; single user</li>
                                        <li>&#x2714; one project</li>
                                        <li>&#x2714; e-mail support</li>
                                        <li>&#x2714; one month trial</li>
                                    </ul>
                                 </div>
                            
                             </div>
                             <div class="card__side card__side--back card__side--back-1">
                                <div class="card__cta">
                                    <div class="card__price-box">
                                        <p class="card__price-only">only</p>
                                        <p class="card__price-value"><sup>$</sup>0</p>
                                    </div>
                                    <a href="#" class="btn btn--white">Buy now!</a>
                                </div>
                
                            </div>
                        
                        </div>
                    </div>
    
    
                    <div class="col-1-of-3">
                            <div class="card">
                                    <div class="card__side card__side--front">
                                        <div class="card__picture card__picture--2">
                                            &nbsp;
                                        </div>
                                        <h4 class="card__heading">
                                            <span class="card__heading-span card__heading-span--2">multi player</span>
                                        </h4>
                                        <div class="card__details">
                                           <ul>

                                               <li>&#x2714; 2-5 users</li>
                                               <li>&#x2714; tree project</li>
                                               <li>&#x2714; phone support*</li>
                                               <li>&#x2714; basic statictics</li>
                                               <li>&#x2714; 6 month</li>
                                           </ul>
                                        </div>
                                   
                                    </div>
                                    <div class="card__side card__side--back card__side--back-2">
                                       <div class="card__cta">
                                           <div class="card__price-box">
                                               <p class="card__price-only">only</p>
                                               <p class="card__price-value"><sup>$</sup>50</p>
                                           </div>
                                           <a href="#" class="btn btn--white">Buy now!</a>
                                       </div>
                       
                                   </div>
                               
                               </div>
                    </div>
    
    
                    <div class="col-1-of-3">
                                         <div class="card">
                             <div class="card__side card__side--front">
                                 <div class="card__picture card__picture--3">
                                     &nbsp;
                                 </div>
                                 <h4 class="card__heading">
                                     <span class="card__heading-span card__heading-span--3">team</span>
                                 </h4>
                                 <div class="card__details">
                                    <ul>
                                         <li>&#x2714; unlimited users</li>
                                         <li>&#x2714; unlimited project</li>
                                         <li>&#x2714; 24*7 phone support</li>
                                         <li>&#x2714; detailed statictics</li>
                                         <li>&#x2714; 12 month</li>
                                    </ul>
                                 </div>
                            
                             </div>
                             <div class="card__side card__side--back card__side--back-3">
                                <div class="card__cta">
                                    <div class="card__price-box">
                                        <p class="card__price-only">only</p>
                                        <p class="card__price-value"><sup>$</sup>100</p>
                                    </div>
                                    <a href="#" class="btn btn--white">Buy now!</a>
                                </div>
                
                            </div>
                        
                        </div>
                    </div>
            </div>
!

CSS 

              
                //COLOR
$color-primary:#55c57a;
$color-primary-light:#e96443;
$color-primary-dark:#904e95;

$color-secondary-light: #3a6186;
$color-secondary-dark: #89253e;

$color-tertiary-light: #ff00cc;
$color-tertiary-dark: #333399;


$color-gray-light-1: #f7f7f7;
$color-gray-light-2: #eee;


$color-white: #fff;
$color-gray-dark: #777777;
$color-black: #000;

//FONT
$default-font-size:1.6rem;


//GRID
$grid-width: 114rem;
$gutter-vertical: 8rem;
$gutter-horizontal: 6rem;



//MIXINS
@mixin clearfix {
    &::after {
        content: "";
        display: table;
        clear: both;
    }
}


*,
*::after,
*::before{

    margin: 0;
    padding: 0;
    box-sizing: inherit;
}

html{
    // this difines what 1rem is
    font-size: 62.5%;
}

body{
    font-family: lato, sans-serif;
    box-sizing: border-box;
    padding: 10vmin;
}




.row {
    max-width: $grid-width;
    ma-rgin: 0 auto;
  

    &:not(:last-child) {
        margin-bottom: $gutter-vertical;
    }

    @include clearfix;

    [class^="col-"] {
        float: left;

        &:not(:last-child) {
            margin-right: $gutter-horizontal;
        }
    }



    .col-1-of-3 {
        width: calc((100% - 2 * #{$gutter-horizontal}) / 3 );
    
    }
}
 
.card {
    perspective: 150rem;
    -moz-perspective: 150rem;
    position: relative;
    height: 52rem;

    &__side {
    height: 52rem;
    transition: all .8s ease;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    backface-visibility: hidden;
    border-radius: 3px;
    overflow: hidden;
    box-shadow: 0 1.5rem 4rem rgba($color-black, .15);

        &--front {
            background-color: $color-white;
        }

        &--back {
            transform: rotateY(180deg);

            &-1 {
                background-image: linear-gradient(to right bottom, $color-secondary-light, $color-secondary-dark);
            }

            &-2 {
                background-image: linear-gradient(to right bottom, $color-primary-light, $color-primary-dark);
            }

            &-3 {
                background-image: linear-gradient(to right bottom, $color-tertiary-light, $color-tertiary-dark);
            }
            
        }

    }
 
    &:hover &__side--front {
        transform: rotateY(180deg);
    }

    &:hover &__side--back {
        transform: rotateY(0);
    }


    //FRONT SIDE STYLE

    &__picture{

        background-size: cover;
        height: 23rem;
        background-blend-mode: screen;
        -webkit-clip-path: polygon(0 0,100% 0,100% 85%,0 100%);
        clip-path: polygon(0 0,100% 0,100% 85%,0 100%);
        border-top-left-radius: 3px;
        border-top-right-radius: 3px;

        &--1 {
            background-image: linear-gradient(to right bottom, $color-secondary-light, $color-secondary-dark);
        }

        &--2 {
            background-image: linear-gradient(to right bottom, $color-primary-light, $color-primary-dark);
        }

        &--3 {
            background-image: linear-gradient(to right bottom, $color-tertiary-light, $color-tertiary-dark);
        }

  
    }

    &__heading {
        font-size: 2.8rem;
        font-weight: 300;
        text-transform: uppercase;
        text-align: right;
        color:$color-white;
        position: absolute;
        top: 12rem;
        right: 2rem;
        width: 75%;

    }

    &__heading-span {
        padding: 1rem 1.5rem;
        -webkit-box-decoration-break: clone;
        box-decoration-break: clone;
        &--1 {
            background-image: linear-gradient(to right bottom, 
            rgba($color-secondary-light, .85),
            rgba( $color-secondary-dark, .85));
        }

        &--2 {
            background-image: linear-gradient(to right bottom, 
            rgba($color-primary-light, .85),
            rgba( $color-primary-dark, .85));
        }

        &--3 {
            background-image: linear-gradient(to right bottom, 
            rgba($color-tertiary-light, .85),
            rgba( $color-tertiary-dark, .85));
        }


    }
    
    &__details {
            padding: 3rem;

         ul {
            list-style: none;
            width: 80%;
            margin: 0 auto;

            li {
                text-align: center;
                font-size: 1.5rem;
                padding: 1rem;

                &:not(:last-child) {
                    border-bottom: 1px solid color-grey light_2;
                }
            }
        }
    }




    // BACK SIDE STYLE

    &__cta {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        width: 90%;
        text-align: center;
    }

    &__price-box {
        text-align: center;
        color: $color-white;
        margin-bottom: 8rem;
    }

    &__price-only {
        font-size: 1.4rem;
        text-transform: uppercase;
    }

    &__price-value {
        font-size: 6rem;
        font-weight: 100;

        sup{
            font-size: 0.65em;
        }
    }
         
}

.btn{
    &:hover {
        transform: translateY(-3px);
        box-shadow: 0 5px 10px rgba($color-black,.2);


        &::after {
            transform: scaleX(1.4) scaleY(1.6);
            opacity: 0;
        }
    }
    
    &:active {
        transform: translateY(-1px);
    }
    
    &--white {
        background-color: $color-white;
        color: $color-gray-dark;

        &::after {
            background-color: $color-white;
        }
    }

    &--green {
        background-color: $color-primary;
        color: $color-white;

        &::after {
            background-color: $color-primary;
        }
    }
    
    &::after {
        content: "";
        display: inline-block;
        height: 100%;
        width: 100%;
        border-radius: 100px;
        position: absolute;
        top: 0;
        left: 0;
        z-index: -1;
        transition: all .4s;
    }
    
    &--animated {
        animation: moveInBottom .5s ease-out .75s;
        animation-fill-mode: backwards;
    }

    
    &:link,
    &:visited {
        text-transform: uppercase;
        text-decoration: none;
        padding: 15px 40px;
        display: inline-block;
        border-radius: 100px;
        transition: all .2s;
        position: relative;
    }
}
!

JS
!
999px

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