Hi!
Your HTML must look like this
<div class="social-buttons clearfix">
<a class="button facebook " href="https://www.facebook.com/......" target="_blank">Facebook</a>
<a class="button twitter " href="https://twitter.com/......" target="_blank">Twitter</a>
<a class="button youtube " href="https://www.youtube.com/c/......" target="_blank">YouTube</a>
</div>
In your style.css add
.social-buttons {
text-align: center;
}
.social-buttons a {
width: 31%;
text-align: center;
margin-bottom: 20px;
height: 55px;
display: inline-block;
padding-top: 15px;
margin-right: 2%;
}
.social-buttons a:last-of-type {
margin-right: 0;
}
This should do it :)