鼠标悬浮移动
body {
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  
  background: linear-gradient(90deg, blue, white, blue);
  
  &:hover {
    background: linear-gradient(270deg, blue, white, blue);
  }
  
  color: #fff;
  font-size: 3vw;
  text-shadow: 1px 1px 0 rgba(0,0,0,1), -1px -1px 0 rgba(0,0,0,.5);
}
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