MediaWiki:Common.css

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body.page-Main_Page.action-view h1.firstHeading,
body.page-Main_Page_de.action-view h1.firstHeading,
body.page-Main_Page.action-submit h1.firstHeading,
body.page-Main_Page_de.action-submit h1.firstHeading
  { display: none; }

/* Remove all the default icons in external links */
/*div#content a.external {
    background:none !important;
    padding: 0px !important;
}*/

/*
div#content a[href ^="https://primes.utm.edu"].external {
    background: url("https://upload.wikimedia.org/wikipedia/commons/3/38/Database.png") center right no-repeat; padding-right: 18px;
}
*/


.mw-parser-output a[href*="primes.utm.edu"].external {
	background: url("https://primes.utm.edu/favicon.ico") no-repeat right; padding-right: 18px;
}

.mw-parser-output a[href*="wikipedia"].external, a[href*="wikipedia"] {
	background: url("https://upload.wikimedia.org/wikipedia/commons/thumb/2/2c/Tango_style_Wikipedia_Icon.svg/16px-Tango_style_Wikipedia_Icon.svg.png") no-repeat right; padding-right: 18px;
}

.mw-parser-output a[href*="www.mersenneforum.org"].external {
	background: url("https://www.mersenneforum.org/favicon.ico") no-repeat right; padding-right: 18px;
}

.mw-parser-output a[href*="mathworld"].external {
	background: url("http://mathworld.wolfram.com/favicon.ico") no-repeat right; background-size:16px 16px; padding-right: 18px;
}

.mw-parser-output a[href*="mersenne.org"].external {
	background: url("https://www.mersenne.org/favicon.ico") no-repeat right; padding-right: 18px;
}

.nopagesincategory #mw-pages {display: none;}