MediaWiki:Vector.css

/* CSS placed here will affect users of the Vector skin */

/* Blue instead of yellow padlock for secure links. */
#bodyContent a.external[href ^="https://"],
.link-https {
  background: url("//upload.wikimedia.org/wikipedia/en/0/00/Lock_icon_blue.gif") center right no-repeat;
  /* @noflip */
  padding-right: 16px;
}

div#mw-panel { width: 190px; }
div#footer, #mw-head-base, div#content, #left-navigation { margin-left: 190px; }