<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" integrity="sha384-wvfXpqpZZVQGK6TAh5PVlGOfQNHSoD2xbE+QkPxCAFlNEevoEH3Sl0sibVcOQVnN" crossorigin="anonymous">
<div class="container">
<ul>
<li><a href="#"><i class="fa fa-facebook" aria-hidden="true"></i></a></li>
<li><a href="#"><i class="fa fa-twitter" aria-hidden="true"></i></a></li>
<li><a href="#"><i class="fa fa-google-plus" aria-hidden="true"></i></a></li>
<li><a href="#"><i class="fa fa-linkedin" aria-hidden="true"></i></a></li>
<li><a href="#"><i class="fa fa-instagram" aria-hidden="true"></i></a></li>
</ul>
</div>
body {
margin:0;
padding:0;
}
ul {
position:absolute;
margin:0;
padding:0;
top:50%;
left:50%;
transform:translate(-50%,-50%);
display:flex;
}
ul li {
list-style:none;
}
ul li a {
position:relative;
display:block;
width:80px;
height:80px;
font-size:20px;
text-align:center;
line-height:80px;
color:#262626;
overflow:hidden;
margin:15px;
transform:rotate(45deg);
transition:.2s;
border:1px solid rgba(0,0,0,1);
}
ul li a .fa{
transform:rotate(-45deg);
font-size: 2rem;
}
ul li a:before {
content:'';
position:absolute;
bottom:-100%;
left:0;
width:100%;
height:100%;
background:#262626;
transition:.2s;
}
ul li a:hover:before {
bottom:0;
}
ul li a:hover {
color:#fff;
}
ul li:nth-child(1) a:before
{
background:#3b5998;
}
ul li:nth-child(2) a:before
{
background:#00aced;
}
ul li:nth-child(3) a:before
{
background:#dd4b39;
}
ul li:nth-child(4) a:before
{
background:#007bb6;
}
ul li:nth-child(5) a:before
{
background:#bc2a8d;
}
