html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  display: flex;
  background-color: #1e2759;
}

.container {
  margin: auto;
}

.container .list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  border-radius: 10px;
  box-shadow: 0 5px 25px rgba(0, 0, 0, 0.5);
}

.container .list .item {
  position: relative;
  color: #fff;
  cursor: pointer;
}

.container .list .item .iconfont {
  display: block;
  position: relative;
  z-index: 2;
  padding: 20px 40px;
  opacity: .5;
  font-size: 20px;
  transition: all .2s;
}

.container .list .item .bg-cricle {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 40px;
  border-radius: 10px;
  transition: all .3s;
  opacity: 0;
  z-index: 1;
}

.container .list .item:hover .iconfont {
  backdrop-filter: blur(20px);
  opacity: 1;
}

.container .list .item:hover .bg-cricle {
  opacity: 1;
}

.container .list .item:first-child .iconfont {
  border-radius: 10px 0 0 10px;
}

.container .list .item:last-child .iconfont {
  border-radius: 0 10px 10px 0;
}

.container .list .item:nth-child(1) .bg-cricle {
  background-color: #1abc9c;
  box-shadow: 0 0 20px #1abc9c, 0 0 35px #1abc9c, 0 0 10px #1abc9c, 0 0 35px #1abc9c;
}

.container .list .item:nth-child(2) .bg-cricle {
  background-color: #2ecc71;
  box-shadow: 0 0 20px #2ecc71, 0 0 35px #2ecc71, 0 0 10px #2ecc71, 0 0 35px #2ecc71;
}

.container .list .item:nth-child(3) .bg-cricle {
  background-color: #3498db;
  box-shadow: 0 0 20px #3498db, 0 0 35px #3498db, 0 0 10px #3498db, 0 0 35px #3498db;
}

.container .list .item:nth-child(4) .bg-cricle {
  background-color: #9b59b6;
  box-shadow: 0 0 20px #9b59b6, 0 0 35px #9b59b6, 0 0 10px #9b59b6, 0 0 35px #9b59b6;
}

.container .list .item:nth-child(5) .bg-cricle {
  background-color: #f1c40f;
  box-shadow: 0 0 20px #f1c40f, 0 0 35px #f1c40f, 0 0 10px #f1c40f, 0 0 35px #f1c40f;
}

.container .list .item:nth-child(6) .bg-cricle {
  background-color: #e67e22;
  box-shadow: 0 0 20px #e67e22, 0 0 35px #e67e22, 0 0 10px #e67e22, 0 0 35px #e67e22;
}

.container .list .item:nth-child(7) .bg-cricle {
  background-color: #e74c3c;
  box-shadow: 0 0 20px #e74c3c, 0 0 35px #e74c3c, 0 0 10px #e74c3c, 0 0 35px #e74c3c;
}