純粋な CSS3 リスト パネルのデザイン効果

<div class="leaderboard">
    <h1>
      <svg class="ico-cup">
        <use xlink:href="#cup"></use>
      </svg>
      Most active Players
    </h1>
    <ol>
      <li>
        <mark>Jerry Wood</mark>
        <small>315</small>
      </li>
      <li>
        <mark>Brandon Barnes</mark>
        <small>301</small>
      </li>
      <li>
        <mark>Raymond Knight</mark>
        <small>292</small>
      </li>
      <li>
        <mark>Trevor McCormick</mark>
        <small>245</small>
      </li>
      <li>
        <mark>Andrew Fox</mark>
        <small>203</small>
      </li>
    </ol>
  </div>
</div>

.leaderboard ol li mark {
  position: absolute;
  z-index: 2;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  padding: 18px 10px 18px 50px;
  margin: 0;
  background: none;
  color: #fff;
}
.leaderboard ol li mark::before, .leaderboard ol li mark::after {
  content: '';
  position: absolute;
  z-index: 1;
  bottom: -11px;
  left: -9px;
  border-top: 10px solid #c24448;
  border-left: 10px solid transparent;
  -webkit-transition: all .1s ease-in-out;
  transition: all .1s ease-in-out;
  opacity: 0;
}
.leaderboard ol li mark::after {
  left: auto;
  right: -9px;
  border-left: none;
  border-right: 10px solid transparent;
}
.leaderboard ol li small {
  position: relative;
  z-index: 2;
  display: block;
  text-align: right;
}
.leaderboard ol li::after {
  content: '';
  position: absolute;
  z-index: 1;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #fa6855;
  box-shadow: 0 3px 0 rgba(0, 0, 0, 0.08);
  -webkit-transition: all .3s ease-in-out;
  transition: all .3s ease-in-out;
  opacity: 0;
}

.leaderboard ol li:hover::after {
  opacity: 1;
  -webkit-transform: scaleX(1.06) scaleY(1.03);
          transform: scaleX(1.06) scaleY(1.03);
}
.leaderboard ol li:hover mark::before, .leaderboard ol li:hover mark::after {
  opacity: 1;
  -webkit-transition: all .35s ease-in-out;
  transition: all .35s ease-in-out;
}