html, body {
  margin: 0;
  width: 100%;
  height: 100%;
  background-image: linear-gradient(to right, #fe6658, #0ca5c2);
}

.container {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

.container .item {
  background-color: rgba(255, 255, 255, 0.3);
  color: #fff;
  width: 50px;
  line-height: 50px;
  height: 50px;
  border-radius: 50%;
  text-align: center;
  position: absolute;
  top: 0;
  left: 0;
  cursor: pointer;
  z-index: 0;
  visibility: hidden;
}

.container .item:hover {
  color: yellow;
}

.container .item.main {
  position: relative;
  z-index: 10;
  visibility: visible;
  overflow: hidden;
}

.container .item.main span {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  transition: all .3s;
}

.container .item.main span.active-txt {
  opacity: 0;
  transform: translate(-50%, 0);
}