Use this to get rid of the annoying horizontal scrollbar on chat.SE and chat.SO main pages. The rest of the design is already adaptive and just works.

@-moz-document domain("chat.stackexchange.com"), domain("chat.stackoverflow.com") {
.topbar .topbar-wrapper {
    width:unset !important;
    max-width: 1060px;
    min-width: 560px; }
body.outside #container {
    width:unset !important;
    max-width: 950px;
    min-width: 250px; }
.footerwrap {width:unset !important;}
.roomcard {margin: 0px 2px 10px 2px}
}

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