bottom-border-transition – 从中​​间扩展

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color: $color-3399E5;
&::before{
                            content: "";
                             position: absolute;
                             top: 0;
                             left: 0;
                             border-bottom: 2px solid $color-3399E5;
                             padding-top: 5px;
                             width: 0;
                            height: 100%;
                         }
                         &:hover{
                             color: $color-3399E5;
                         }
                         &:hover::before{
                             width: 100%;
                             transition: 0.35s all ease-in 0.1s;
                         }。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。body {
  padding: 50px;
}
  
a,a:hover {
  color: #000;
  text-decoration: none;
}
  
li {
  display: inline-block;
  position: relative;
  padding-bottom: 3px;
  margin-right: 10px;
}
li:last-child {
  margin-right: 0;
}
  
li:after {
  content: '';
  display: block;
  margin: auto;
  height: 3px;
  width: 0px;
  background: transparent;
  transition: width .5s ease,background-color .5s ease;
}
li:hover:after {
  width: 100%;
  background: blue;
}
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</ul>
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<a href="https://www.cnblogs.com/xiaohuochai/p/5347930.html" target="_blank">深入理解CSS过渡transition </a><br><a href="https://www.zhangxinxu.com/study/201011/css3-transition-animate-demo-3.html" target="_blank" rel="noopener nofollow">CSS3 transition下不同过渡类型效果展示 >></a>

 

 

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