MediaWiki:Common.css

/* CSS placed here will be applied to all skins */
a {
    color: #337ab7 !important;
}

a.external {
    color: #337ab7 !important;
}

a:visited {
    color: #337ab7 !important;
}

a.external:visited {
    color: #337ab7 !important;
}

a.new {
  color: #b52b27 !important;
}

a.new:visited {
  color: #b52b27 !important;
}

.btn a {
    color: #fff !important;
}

.btn a:visited {
    color: #fff !important;
}