<style>
*{
transition: all 0.6s;
}

html {
height: 100%;
}

body{
font-family: 'Lato', sans-serif;
color: #888;
margin: 0;
}

#main{
display: table;
width: 100%;
height: 100vh;
text-align: center;
}

.fof{
display: table-cell;
vertical-align: middle;
}

.fof h1{
font-size: 50px;
display: inline-block;
padding-right: 12px;
animation: type .5s alternate infinite;
}

@keyframes type{
from{box-shadow: inset -3px 0px 0px #888;}
to{box-shadow: inset -3px 0px 0px transparent;}
}

</style>

<div id="main">
<div class="fof">
<h1>Error 404</h1>
<h3>Page does not exist!</h3>
</div>
</div>