*{
  padding: 0;
  margin: 0;
}
body{
  background: #000;
}
.wrap{
  width: 7.5rem;
  min-height: 12rem;
  margin: 0 auto;
  position: relative;
  overflow: hidden;
}
.submit{
  display: block;
  width: 5.66rem;
  margin: 10.8rem auto 0;
  cursor: pointer;
  animation: yybtn 1s linear infinite;
  -webkit-animation: yybtn 1s linear infinite;
}
@keyframes yybtn {
  0%{
    transform: scale(1);
  }
  50%{
    transform: scale(0.9);
  }
  100%{
    transform: scale(1);
  }
}
@-webkit-keyframes yybtn {
  0%{
    transform: scale(1);
  }
  50%{
    transform: scale(0.9);
  }
  100%{
    transform: scale(1);
  }
}