Flexbox!
html
<div class="container">
<div class="center">
<h1>ayyeeeeee</h1>
</div>
</div>
css
.container{
display: flex;
align-items: center;
justify-content: center;
}
.center{
padding: 10px 20px;
background: #353535;
text-align: center;
}
h1{
color: #fefefe;
}