多种超链接下划线的CSS样式参考

<div class="wrapper">
<h1>Hyperlink :hover CSS Animations</h1>
<ol>
<li>
<div class="effect-one"><a>Underline – Inside out</a></div></li>
<li>
<div class="effect-two"><a>Underline – Right to Left</a></div></li>
<li>
<div class="effect-three"><a>Underline – Right to Left</a></div></li>
<li>
<div class="effect-four"><a>Underline – Bounce down</a></div></li>
<li>
<div class="effect-five"><a>Background color – Right to Left</a></div></li>
<li>
<div class="effect-six"><a>Background color – Left to Right</a></div></li>
<li>
<div class="effect-seven"><a>Background color – Bottom to Top</a></div></li>
<li>
<div class="effect-eight"><a>Background color – Top to Bottom</a></div></li>
</ol>
</div>

/* Demo styles */

$mainColor: #21242C;
body {
font-family: 'Open Sans', sans-serif;
background: $mainColor;
color: white;
font-size: 20px;
padding: 0;
}
a {
cursor: pointer;
text-decoration: none;
}
ol, li {
margin: 0;
padding: 0;
}
li {
padding: 12px;
}
.wrapper {
width: 100%;
max-width: 400px;
margin: 0 auto 0 auto;
}

/**
* ANIMATIONS CSS ———————————
*/

// Animation 1
// Underline – Inside Out
.effect-one > a {
position: relative;
&:before {
content: "";
position: absolute;
width: 100%;
height: 2px;
bottom: 0;
margin: -5px 0;
background-color: white;
visibility: hidden;
transform: scaleX(0);
transition: all 0.4s ease-in-out 0s;
}
&:hover:before {
visibility: visible;
transform: scaleX(1);
}
}

// Animation 2
// Underline – Right to Left
.effect-two > a {
display: inline-block;
position: relative;
&:after {
content: "";
display: block;
position: absolute;
width: 0;
bottom: 0;
height: 2px;
margin: -5px 0;
right: 0;
background-color: white;
transition: all 0.4s ease-in 0s;
}
&:hover:after {
width: 100%;
}
}

// Animation 3
// Underline – Left to Right
.effect-three > a {
display: inline-block;
position: relative;
&:after {
content: "";
display: block;
position: absolute;
width: 0;
bottom: 0;
height: 2px;
margin: -5px 0;
left: 0;
background-color: white;
transition: all 0.4s ease-in 0s;
}
&:hover:after {
width: 100%;
}
}

// Animation 4
// Background color – Right to Left
.effect-four > a {
padding: 0 0 4px 0;
border-bottom: 2px solid $mainColor;
transition: 0.3s ease;
&:hover{
padding: 0 0 6px 0;
border-color: white;
}
}

// Animation 5
// Background color – Left to Right
.effect-five > a {
padding: 0 5px;
box-shadow: inset 0 0 0 0 white;
transition: all 0.4s ease-in-out 0s;
&:hover{
box-shadow: inset -300px 0 0 0 white;
color: $mainColor;
}
}

// Animation 6
// Background color – Left to Right
.effect-six > a {
padding: 0 5px;
box-shadow: inset 0 0 0 0 white;
transition: all 0.4s ease-in-out 0s;
&:hover{
box-shadow: inset 300px 0 0 0 white;
color: $mainColor;
}
}

// Animation 7
// Background color – Bottom to Top
.effect-seven > a {
padding: 0 5px;
box-shadow: inset 0 0 0 0 white;
transition: all 0.5s ease-in-out 0s;
&:hover{
box-shadow: inset 0 -300px 0 0 white;
color: $mainColor;
}
}

// Animation 8
// Background color – Top to Bottom
.effect-eight > a {
padding: 0 5px;
box-shadow: inset 0 0 0 0 white;
transition: all 0.5s ease-in-out 0s;
&:hover{
box-shadow: inset 0 300px 0 0 white;
color: $mainColor;
}
}