Just thought I’d share this nifty font-awesome snippet that tells the visitor your website is mobile-friendly…
Use this css to align the desktop icon and colour the checks:
.times-desktop.fa-2x.fa-stack-1x {margin-left:13px;}
.fa-times {color:#1ca827;}
.fa-check {color:#1ca827;}
<span class="fa-stack fa-lg">
<i class="fa fa-mobile fa-3x fa-stack-1x"></i>
<i class="fa fa-check fa-2x fa-stack-1x"></i>
</span>
<span class="fa-stack fa-lg">
<i class="fa fa-tablet fa-3x fa-stack-1x"></i>
<i class="fa fa-check fa-2x fa-stack-1x"></i>
</span>
<span class="fa-stack fa-lg">
<i class="fa fa-desktop fa-3x fa-stack-1x"></i>
<i class="fa fa-check times-desktop fa-2x fa-stack-1x"></i>
</span>