In order to stack Font Awesome ions, someone wrote a custom CSS solution that features a class called “icons-stack”, which looks like:
.icon-stack {
position: relative;
display: inline-block;
width: 150px;
height: 150px;
line-height: 80px;
vertical-align: middle;
}
.icon-stack-1x,
.icon-stack-2x,
.icon-stack-3x {
position: absolute;
left: 0;
width: 100%;
text-align: center;
}
.icon-stack-1x {
line-height: inherit;
}
.icon-stack-2x {
font-size: 70px;
}
.icon-stack-3x {
font-size: 150px;
}
In the HTML, you would use a span and place the stacked icons inside. These icons will be designated with ‘icon-stack-2x’ or ‘icon-stack-3x’. For example:
<span class="icon-stack"> <i class="fa fa-sun-o icon-stack-3x ot-icons-od"></i> <i class="fas fa-exclamation-triangle icon-stack-2x ot-icons-od"></i> </span>
In this example, I stacked the FA version 4 “fa-sun-o” icon with FA version 5 “fa-exclamation-triangle” icon.
See the Pen how to stack font awesome icons by Chris Nielsen (@Chris_Nielsen) on CodePen.
The original solution on Stack Overflow can be seen here:
https://stackoverflow.com/a/25596423/2317066
Font Awesome is here:
https://fontawesome.com/