XF 1.3 notice popup - replace close image with font awesome

[Adam Howard]

I'm fairly sure that's a small close button made using a photo (unless it's text?).

How would I replace that small photo with font awesome?

 

[TPerry]

I'm fairly sure that's a small close button made using a photo (unless it's text?).
How would I replace that small photo with font awesome?

.xenOverlay a.close
{
    background: none;
    right: 6px;
}

.xenOverlay a.close:before
{
    content: "\f057";
    display: inline-block;
    font-family: FontAwesome;
    font-style: normal;
    font-weight: normal;
    font-size: 22pt;
    color: rgb(156, 155, 155) !important;
}

seems to work for me.