Чекбоксы с качественно выполненным UI (User Interface Design) на чистом CSS

<ul>
  <li>
    <label>
      <input type="checkbox" name="">
      <div class="icon-box">
        <i class="fa fa-home" aria-hidden="true"></i>
      </div>
    </label>
  </li>
  <li>
    <label>
      <input type="checkbox" name="">
      <div class="icon-box">
        <i class="fa fa-phone" aria-hidden="true"></i>
      </div>
    </label>
  </li>
  <li>
    <label>
      <input type="checkbox" name="">
      <div class="icon-box">
        <i class="fa fa-plane" aria-hidden="true"></i>
      </div>
    </label>
  </li>
  <li>
    <label>
      <input type="checkbox" name="">
      <div class="icon-box">
        <i class="fa fa-snowflake-o" aria-hidden="true"></i>
      </div>
    </label>
  </li>
  <li>
    <label>
      <input type="checkbox" name="">
      <div class="icon-box">
        <i class="fa fa-battery-full" aria-hidden="true"></i>
      </div>
    </label>
  </li>
  <li>
    <label>
      <input type="checkbox" name="">
      <div class="icon-box">
        <i class="fa fa-code" aria-hidden="true"></i>
      </div>
    </label>
  </li>
</ul>

ul {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  border-radius: 10px;
  padding: 20px;
  width: 240px;
  background: #ebf5fc;
  box-shadow: -2px -2px 5px white, 3px 3px 5px rgba(0, 0, 0, 0.1);
}
ul li {
  position: relative;
  list-style: none;
  text-align: center;
  margin: 15px;
}
ul li label {
  position: relative;
  cursor: pointer;
}
ul li label input[type="checkbox"] {
  position: absolute;
  opacity: 0;
}
ul li label :checked~.icon-box {
  box-shadow: inset -2px -2px 5px white, inset 3px 3px 5px rgba(0, 0, 0, 0.1);
}
ul li label :checked~.icon-box .fa {
  transform: scale(0.95);
}
ul li label .icon-box {
  width: 60px;
  height: 60px;
  background: #ebf5fc;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: -2px -2px 5px white, 3px 3px 5px rgba(0, 0, 0, 0.1);
  border-radius: 10px;
}
ul li label .icon-box .fa {
  font-size: 30px;
  color: #6a9bd8;
}
/* --------Social Icons-------- */
.social-icons {
  display: flex;
  position: absolute;
  bottom: 25px;
  right: 25px;
}
.social-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  width: 40px;
  height: 40px;
  margin: 0 0.7rem;
  border-radius: 50%;
  cursor: pointer;
  font-family: "Helvetica Neue", "Helvetica", "Arial", sans-serif;
  font-size: 1.5rem;
  text-decoration: none;
  transition: all 0.15s ease;
}
.social-icon:hover {
  color: #fff;
}
.social-icon:hover .tooltip {
  visibility: visible;
  opacity: 1;
  transform: translate(-50%, -150%);
}
.social-icon:active {
  box-shadow: 0px 1px 3px rgba(0, 0, 0, 0.5) inset;
}
.social-icon--twitter {
  background: #2b97f1;
  color: #fff;
}
.social-icon--twitter .tooltip {
  background: #2b97f1;
  color: currentColor;
}
.social-icon--twitter .tooltip:after {
  border-top-color: #2b97f1;
}
.social-icon--codepen {
  background: #000;
  color: #fff;
}
.social-icon--codepen .tooltip {
  background: #000;
  color: currentColor;
}
.social-icon--codepen .tooltip:after {
  border-top-color: #000;
}
.social-icon i {
  position: relative;
  top: 1px;
}