<div class="triangle">
  <div class="top">Top</div>
  <div class="mid">Middle</div>
  <div class="bottom">Bottom</div>
</div>

body {
  justify-content: center;
  background-image: linear-gradient(black, white);
  height: 100vh;
  display: flex;
  flex-direction: column;
}

.triangle {
  position: relative;
  height: 320px;
  clip-path: polygon(50% 0%, 20% 100%, 80% 100%);
}

.triangle div {
  position: absolute;
  top: 0;
  background: red;
  width: 100%;
  height: 100px;
  margin: 0 auto;
  color: white;
  line-height: 100px;
  text-align: center;
  font-size: 0.8em;
  color: red;
  transition: all ease 0.6s;
}

.triangle:hover div {
  color: white;
}

.top {
  z-index: 2;
}

.mid {
  z-index: 1;
}

.triangle:hover .mid {
  top: 110px;
  background: yellow;
}

.triangle:hover .bottom {
  top: 220px;
  background: blue;
}