Here is the code to add an image for the welcome banner:
.WelcomeHero {
background-image: url('http://s16.postimg.org/jadqzvq05/11885187_868739293246020_3494243832978895779_n.png');
background-size: cover;
color: white;
}
.Hero-close {
display: none;
}
I believe (but haven't tested yet) a modification can be made to the above whereby if you add .TagTile.colored:nth-child(x) { it may work:
(what the below does is change the background of the tag in the tag page, but unfortunately I'm not too sure how to change the background of the banner according to tags ?
Replace x with 1, 2, 3, 4, 5 ... (tags)
.TagTile.colored:nth-child(x) {
background-image: url('http://s16.postimg.org/jadqzvq05/11885187_868739293246020_3494243832978895779_n.png');
background-size: cover;
color: white;
}