html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  display: flex;
  font-size: 15px;
}

ul {
  margin: auto;
  padding: 0;
  list-style: none;
  height: 100%;
  overflow-y: auto;
  width: 100%;
  position: relative;
  box-sizing: border-box;
  background-color: #2f2e33;
}

ul .item {
  width: 100%;
  height: 4rem;
  margin-bottom: 1rem;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  transform: scale(0.4);
  transition: all .7s;
  transform-origin: center;
}

ul .item.active {
  transform: scale(1);
}

ul .item .left-wraper {
  display: flex;
}

ul .item .left-wraper .icon {
  width: 3rem;
  height: 3rem;
  border-radius: 0.3rem;
  background-color: #fff;
}

ul .item .left-wraper .icon img {
  width: 100%;
}

ul .item .left-wraper .desc {
  margin-left: 10px;
  color: #fff;
}

ul .item button {
  outline: none;
  border: 1px solid #3f60a1;
  background-color: transparent;
  border-radius: 8rem;
  padding: .3rem 1rem;
  color: #3f60a1;
}