zulip/static/styles/user_status.css

#set_user_status_modal {
    /* A narrower width is more attractive for this modal. */
    width: 384px;
    @media (width < $ml_min) {
        width: 100%;
    }

    /* Center `position-fixed` modal */
    left: 50%;
    transform: translate(-50%, -50%);
    margin-left: 0;

    input.user_status {
        width: 94%;
        @media (width < $ml_min) {
            width: 93%;
        }
    }

    .user-status-options {
        padding-top: 10px;
        padding-left: 2px;

        button.user-status-value:hover {
            /* Important is required for generic night them styling to not
               have precedence over this. */
            color: hsl(200, 100%, 40%) !important;
        }

        .user-status-value {
            width: 100%;
            text-align: left;
            margin-bottom: 10px;
            line-height: 1.1em;
        }
    }
}