.content {
    width: 90vw;

  text-align:center;
  position: fixed;
  left: 5vw;
  top:60vh; color:white;line-height: 2.3rem;  font-size: 1.3rem; 
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}
.item {

    letter-spacing:10px;
    cursor: pointer;
  display: block;
  height: 2.6rem;
  width: 15rem;
  line-height: 2.6rem;
  margin: 0 auto;
  animation-duration: 3s;
  animation-delay: 0.8s;
    animation-name: slidein;
    animation-fill-mode: forwards;
  border: 2px solid white;
  opacity: 0;
  background-color: rgba(15, 184, 173,.3);
  transition: .8s all ease;
}
.content_b {
  margin-top: 6rem;
}
.item:hover {
letter-spacing:5px;
}
.item_title {
  line-height: 2.3rem;
      font-size: 1rem;
    color: white;
}
.lyric {
  top:23vh; 
    opacity: 0;
    line-height: 3.5rem;
      animation-fill-mode: forwards;
  animation-duration: 3s;
  animation-name: slidein;
}
@keyframes slidein {
  from {
    transform: translateY(100px);
    opacity: 0;
  }

  to {
     transform: translateY(0);
     opacity: 1;
  }
}

#contact {
  display: none;
  overflow: hidden;
  text-align: center;
  padding: 0.8rem 2rem;
  color: white;
  background-color: #181818;
  /* border-radius: 12px; */
  position: fixed;
  opacity: 0;
  bottom: 1rem;
  width: 24rem;
  font-size: 1rem;
  animation-fill-mode: forwards;
  animation-duration: 3s;
  animation-name: slidein;
  /* animation-delay: 1.3s; */
  left: calc(50vw - 12rem);
  transition: .8s all cubic-bezier(0.43, 0.12, 0.12, 1.12);
}
#contact:hover {
  border-radius: 12px;
  transform: scale(1.1);
}

#contact_close {
  font-size: 1rem;
  float: right;
  cursor: pointer;
}

#wechat {
  margin: 0 auto;
  border: none;
  width: 17rem;
  display: block;
}