MediaWiki:Monobook.css

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/* All CSS here will be loaded for users of the MonoBook skin */
#toc {
    position: fixed;
    right: 0;
    top: 7em; /* 5em is height of header, 6em brings just under */
    /* bottom: 5em; /* 5em puts us above the footer; not bad but too low when TOC is collapsed */

    z-index: 10000; /* Ensure we float above the header, etc. */

    /* Add opacity (translucency) */
    background-color: rgb(249, 249, 249);
    background-color: rgba(249, 249, 249, 0.9); /* Higher opacity (last arg) means less transparency */
}
/* Ensure the TOC height doesn't take over the screen; percentages may be higher than view port, so we use pixels */
#toc > ul {
    max-height: 350px;
    overflow: auto; 
}