<div id="info">Observe the platform icon's motion direction when there is up and down hover on options.</div>

<form id="app-cover">
            <div id="select-box">
                    <input type="checkbox" id="options-view-button">
                    <div id="select-button" class="brd">
                            <div id="selected-value">
                                <span>Select a platform</span>
                            </div>
                            <div id="chevrons">
                                    <i class="fas fa-chevron-up"></i>
                                    <i class="fas fa-chevron-down"></i>
                            </div>
                    </div>
                    <div id="options">
                            <div class="option">
                                    <input class="s-c top" type="radio" name="platform" value="codepen">
                                    <input class="s-c bottom" type="radio" name="platform" value="codepen">
                                    <i class="fab fa-codepen"></i>
                                    <span class="label">CodePen</span>
                                    <span class="opt-val">CodePen</span>
                            </div>
                            <div class="option">
                                    <input class="s-c top" type="radio" name="platform" value="dribbble">
                                    <input class="s-c bottom" type="radio" name="platform" value="dribbble">
                                    <i class="fab fa-dribbble"></i>
                                    <span class="label">Dribbble</span>
                                    <span class="opt-val">Dribbble</span>
                            </div>
                            <div class="option">
                                    <input class="s-c top" type="radio" name="platform" value="behance">
                                    <input class="s-c bottom" type="radio" name="platform" value="behance">
                                    <i class="fab fa-behance"></i>
                                    <span class="label">Behance</span>
                                    <span class="opt-val">Behance</span>
                            </div>
                            <div class="option">
                                    <input class="s-c top" type="radio" name="platform" value="hackerrank">
                                    <input class="s-c bottom" type="radio" name="platform" value="hackerrank">
                                    <i class="fab fa-hackerrank"></i>
                                    <span class="label">HackerRank</span>
                                    <span class="opt-val">HackerRank</span>
                            </div>
                            <div class="option">
                                    <input class="s-c top" type="radio" name="platform" value="stackoverflow">
                                    <input class="s-c bottom" type="radio" name="platform" value="stackoverflow">
                                    <i class="fab fa-stack-overflow"></i>
                                    <span class="label">StackOverflow</span>
                                    <span class="opt-val">StackOverflow</span>
                            </div>
                            <div class="option">
                                    <input class="s-c top" type="radio" name="platform" value="freecodecamp">
                                    <input class="s-c bottom" type="radio" name="platform" value="freecodecamp">
                                    <i class="fab fa-free-code-camp"></i>
                                    <span class="label">FreeCodeCamp</span>
                                    <span class="opt-val">FreeCodeCamp</span>
                            </div>
                            <div id="option-bg"></div>
                    </div>
            </div>
    </form>

<!-- <a href="https://www.youtube.com/channel/UC7hSS_eujjZOEQrjsda76gA/videos" target="_blank" id="ytd-url">My YouTube Channel</a> -->
*
{
    user-select: none;
}

*:focus
{
    outline: none;
}

html, body
{
    height: 100%;
    min-height: 100%;
}

body
{
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    padding-bottom: 100px;
    margin: 0;
    background-color: #ebf3f3;
}

.brd
{
    border: 1px solid #e2eded;
    border-color: #eaf1f1 #e4eded #dbe7e7 #e4eded;
}

#info
{
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    color: #2d3667;
    font-size: 16px;
    text-align: center;
    padding: 14px;
    background-color: #f3f9f9;
}

#app-cover
{
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    width: 300px;
    height: 42px;
    margin: 100px auto 0 auto;
}

#select-button
{
    position: relative;
    height: 16px;
    padding: 12px 14px;
    background-color: #fff;
    border-radius: 4px;
    cursor: pointer;
}

#options-view-button
{
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    margin: 0;
    opacity: 0;
    cursor: pointer;
    z-index: 3;
}

#selected-value
{
    font-size: 16px;
    line-height: 1;
    margin-right: 26px;
}

.option i
{
    width: 16px;
    height: 16px;
}

.option, .label
{
    color: #2d3667;
    font-size: 16px;
}

#chevrons
{
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: 12px;
    padding: 9px 14px;
}

#chevrons i
{
    display: block;
    height: 50%;
    color: #d1dede;
    font-size: 12px;
    text-align: right;
}

#options-view-button:checked + #select-button #chevrons i
{
    color: #2d3667;
}

.options
{
    position: absolute;
    left: 0;
    width: 250px;
}

#options
{
    position: absolute;
    top: 42px;
    right: 0;
    left: 0;
    width: 298px;
    margin: 0 auto;
    background-color: #fff;
    border-radius: 4px;
}

#options-view-button:checked ~ #options
{
    border: 1px solid #e2eded;
    border-color: #eaf1f1 #e4eded #dbe7e7 #e4eded;
}

.option
{
    position: relative;
    line-height: 1;
    transition: 0.3s ease all;
    z-index: 2;
}

.option i
{
    position: absolute;
    left: 14px;
    padding: 0;
    display: none;
}

#options-view-button:checked ~ #options .option i
{
    display: block;
    padding: 12px 0;
}

.label
{
    display: none;
    padding: 0;
    margin-left: 27px;
}

#options-view-button:checked ~ #options .label
{
    display: block;
    padding: 12px 14px;    
}

.s-c
{
    position: absolute;
    left: 0;
    width: 100%;
    height: 50%;
}

.s-c.top
{
    top: 0;
}

.s-c.bottom
{
    bottom: 0;
}

input[type="radio"]
{
    position: absolute;
    right: 0;
    left: 0;
    width: 100%;
    height: 50%;
    margin: 0;
    opacity: 0;
    cursor: pointer;
}

.s-c:hover ~ i
{
    color: #fff;
    opacity: 0;
}

.s-c:hover
{
    height: 100%;
    z-index: 1;
}

.s-c.bottom:hover + i
{
    bottom: -25px;
    animation: moveup 0.3s ease 0.1s forwards;
}

.s-c.top:hover ~ i
{
    top: -25px;
    animation: movedown 0.3s ease 0.1s forwards;
}

@keyframes moveup
{
    0%{ bottom: -25px; opacity: 0;}
    100%{ bottom: 0; opacity: 1;}
}

@keyframes movedown
{
    0%{ top: -25px; opacity: 0;}
    100%{ top: 0; opacity: 1;}
}

.label
{
    transition: 0.3s ease all;
}

.opt-val
{
    position: absolute;
    left: 14px;
    width: 217px;
    height: 21px;
    opacity: 0;
    background-color: #fff;
    transform: scale(0);
}

.option input[type="radio"]:checked ~ .opt-val
{
    opacity: 1;
    transform: scale(1);
}

.option input[type="radio"]:checked ~ i
{
    top: 0;
    bottom: auto;
    opacity: 1;
    animation: unset;
}

.option input[type="radio"]:checked ~ i, .option input[type="radio"]:checked ~ .label
{
    color:#fff;
}

.option input[type="radio"]:checked ~ .label:before
{
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: -1;
}

#options-view-button:not(:checked) ~ #options .option input[type="radio"]:checked ~ .opt-val
{
    top: -30px;
}

.option:nth-child(1) input[type="radio"]:checked ~ .label:before
{
    background-color: #000;
    border-radius: 4px 4px 0 0;
}

.option:nth-child(1) input[type="radio"]:checked ~ .opt-val
{
    top: -31px;
}

.option:nth-child(2) input[type="radio"]:checked ~ .label:before
{
    background-color: #ea4c89;
}

.option:nth-child(2) input[type="radio"]:checked ~ .opt-val
{
    top: -71px;
}

.option:nth-child(3) input[type="radio"]:checked ~ .label:before
{
    background-color: #0057ff;
}

.option:nth-child(3) input[type="radio"]:checked ~ .opt-val
{
    top: -111px;
}

.option:nth-child(4) input[type="radio"]:checked ~ .label:before
{
    background-color: #32c766;
}

.option:nth-child(4) input[type="radio"]:checked ~ .opt-val
{
    top: -151px;
}

.option:nth-child(5) input[type="radio"]:checked ~ .label:before
{
    background-color: #f48024;
}

.option:nth-child(5) input[type="radio"]:checked ~ .opt-val
{
    top: -191px;
}

.option:nth-child(6) input[type="radio"]:checked ~ .label:before
{
    background-color: #006400;
    border-radius: 0 0 4px 4px;
}

.option:nth-child(6) input[type="radio"]:checked ~ .opt-val
{
    top: -231px;
}

.option .fa-codepen
{
    color: #000;
}

.option .fa-dribbble
{
    color: #ea4c89;
}

.option .fa-behance
{
    color: #0057ff;
}

.option .fa-hackerrank
{
    color: #32c766;
}

.option .fa-stack-overflow
{
    color: #f48024;
}

.option .fa-free-code-camp
{
    color: #006400;
}

#option-bg
{
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    height: 40px;
    transition: 0.3s ease all;
    z-index: 1;
    display: none;
}

#options-view-button:checked ~ #options #option-bg
{
    display: block;
}

.option:hover .label
{
    color: #fff;
}

.option:nth-child(1):hover ~ #option-bg
{
    top: 0;
    background-color: #000;
    border-radius: 4px 4px 0 0;
}

.option:nth-child(2):hover ~ #option-bg
{
    top: 40px;
    background-color: #ea4c89;
}

.option:nth-child(3):hover ~ #option-bg
{
    top: 80px;
    background-color: #0057ff;
}

.option:nth-child(4):hover ~ #option-bg
{
    top: 120px;
    background-color: #32c766;
}

.option:nth-child(5):hover ~ #option-bg
{
    top: 160px;
    background-color: #f48024;
}

.option:nth-child(6):hover ~ #option-bg
{
    top: 200px;
    background-color: #006400;
    border-radius: 0 0 4px 4px;
}

#ytd-url {
  display: block;
  position: fixed;
  right: 0;
  bottom: 0;
  padding: 10px 14px;
  margin: 20px;
  color: #fff;
  font-size: 14px;
  text-decoration: none;
  background-color: #143240;
  border-radius: 4px;
  box-shadow: 0 10px 20px -5px rgba(20, 50, 64, 0.76);
}

External CSS

  1. https://use.fontawesome.com/releases/v5.3.1/css/all.css
  2. https://use.fontawesome.com/releases/v5.3.1/css/fontawesome.css

External JavaScript

This Pen doesn't use any external JavaScript resources.