MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */

body {
 background-image: url('https://sulane.net/img/bg.jpg');
}

#mw-header {
    background-color: #191970;  /* Replace with your desired color */
}

td.clickablecell a {
    display:table-cell;    /* display: table-cell */
    border: 1px solid; 
    /*padding: 5px; */
    width:100%;

}