查看“MediaWiki:Timeless.css”的源代码

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

/* 更适合Timeless的按钮 */
.mw-ui-button {
    padding: 0.25em 1em 0.1em 1em;
    border: solid 1px #cccccc;
        border-bottom-width: 1px;
    border-bottom-width: 0.2em;
    text-shadow: 0 -1px 0 #cccccc;
    box-sizing: border-box;
    border-radius: 0.2em;
    min-height: 30px;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}