Changes
/********************************************/
/* MEDIAWIKI */
a.external :after { content:""; background:url(images/external-link-ltr-icon.png);/* text-indent:-999em; display:block; width:32px; height:32px; background:url(../img/icons/spritesheet.png) 0 -620px no-repeat; margin:5% 0 0 45%;*/ background-position: center right;
background-repeat: no-repeat;
.background-image-svg('images/external-link-ltr-icon.svg', 'images/external-link-ltr-icon.png');
padding-right: 13px;
.container {