Pure CSS Select Box With Direction Aware Hover Effect

index.html

<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>

style.css

* {
  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;
  z-index: 1;
}

#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;
}

styles

<link href="https://use.fontawesome.com/releases/v5.3.1/css/all.css" rel="stylesheet" />
<link href="https://use.fontawesome.com/releases/v5.3.1/css/fontawesome.css" rel="stylesheet" />