<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="container">
<section class="footer__col footer__col--next">
<div class="row">
<div class="col-lg-12 h-100 d-flex align-item-center justify-content-center">
<a href="/about" class="footer__btn" data-footer-link="2">
<span>Next: About</span>
<div class="footer__btn-line">
<div class="footer__btn-line-inner"></div>
</div>
</a>
</div>
</div>
</section>
</div>
body{
background-color:#000;
height:100vh;
}
.footer__col--next {
clear: right;
margin-top: -5px;
margin-right: 0;
min-width: auto;
}
.footer__btn {
color: #343945;
float: left;
font-size: 15px;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: antialiased;
line-height: 35px;
margin-top: 20px;
position: relative;
text-align: center;
}
.footer__btn>span {
color: #fff;
cursor: pointer;
pointer-events: none;
position: relative;
transition: color .6s ease;
z-index: 5;
}
.footer__btn-line {
bottom: -5px;
cursor: pointer;
height: 1px;
left: 0;
pointer-events: none;
position: absolute;
transition: -webkit-transform .5s cubic-bezier(.215,.61,.355,1);
transition: transform .5s cubic-bezier(.215,.61,.355,1);
transition: transform .5s cubic-bezier(.215,.61,.355,1),-webkit-transform .5s cubic-bezier(.215,.61,.355,1);
width: 100%;
}
.footer__btn-line-inner {
background-color: #fff;
height: 100%;
position: absolute;
left: 0;
top: 0;
-webkit-transform-origin: bottom center;
transform-origin: bottom center;
transition: -webkit-transform .7s cubic-bezier(.86,0,.07,1);
transition: transform .7s cubic-bezier(.86,0,.07,1);
transition: transform .7s cubic-bezier(.86,0,.07,1),-webkit-transform .7s cubic-bezier(.86,0,.07,1);
width: 100%;
}
.footer__btn:after {
background-color: #000;
bottom: -5px;
content: "";
height: 160%;
left: 0;
position: absolute;
-webkit-transform: scaleX(1.25) scaleY(0);
transform: scaleX(1.25) scaleY(0);
-webkit-transform-origin: center bottom;
transform-origin: center bottom;
transition: -webkit-transform .7s cubic-bezier(.86,0,.07,1);
transition: transform .7s cubic-bezier(.86,0,.07,1);
transition: transform .7s cubic-bezier(.86,0,.07,1),-webkit-transform .7s cubic-bezier(.86,0,.07,1);
width: 100%;
}
.footer__btn:hover .footer__btn-line-inner, .footer__btn[data-trigger-animation=true] .footer__btn-line-inner {
-webkit-transform: scaleY(48);
transform: scaleY(48);
color:#000;
}
.footer__btn:hover .footer__btn-line, .footer__btn[data-trigger-animation=true] .footer__btn-line {
-webkit-transform: scaleX(1.4);
transform: scaleX(1.4);
}
.footer__btn:hover>span, .footer__btn[data-trigger-animation=true]>span {
color: #000;
}
