.liquid {
  display: inline-block;
  position: relative;
  width: 240px;
  height: 60px;

  border-radius: 27px;

  color: #fff;
  font: 700 20px/60px "演示斜黑体", sans-serif;
  letter-spacing: 0.05em;
  text-align: center;
  text-decoration: none;
  text-transform: uppercase;
}

.liquid .inner {
  position: relative;

  z-index: 2;
}

.liquid canvas {
  position: absolute;
  top: -50px;
  right: -50px;
  bottom: -50px;
  left: -50px;

  z-index: 1;
}