:root {
  --main-color: #3fc3c7;
}
.main .ystd-banner {
  width: 640px;
  height: 350px;
  margin-bottom: 20px;
}
.main .ystd-list {
  width: 620px;
  height: 1344px;
  overflow: hidden;
  animation: height 3s;
}
.main .ystd-list li {
  margin-bottom: 20px;
  position: relative;
}
.main .ystd-list li a {
  display: block;
  width: 132px;
  height: 36px;
  text-align: center;
  color: #fff;
  line-height: 36px;
  font-size: 16px;
  position: absolute;
  bottom: 45px;
}
.main .ystd-list li a:nth-of-type(1) {
  background-color: var(--main-color);
  left: 14px;
}
.main .ystd-list li a:nth-of-type(2) {
  background-color: #ef9844;
  left: 156px;
}
.main .ystd-list-height-auto {
  height: auto;
}
.main .ystd-xia {
  text-align: center;
  margin-bottom: 50px;
  animation: ystd-xiala 3s infinite;
}
.main .ystd-up img {
  transform: rotateZ(180deg);
}
@keyframes ystd-xiala {
  0% {
    transform: translateY(0px);
  }
  25% {
    transform: translateY(20px);
  }
  50% {
    transform: translateY(0px);
  }
  100% {
    transform: translateY(0px);
  }
}