jitsi_app_c0/css/_side_toolbar_container.scss

/**
 * Toolbar side panel main container element.
 */
#sideToolbarContainer {
    position: absolute;
    top: 0;
    //magic 10px for toolbar height. TODO: fix it
    bottom: 10px;
    left: $defaultToolbarSize;
    width: 0;
    background-color: rgba(0,0,0,0.8);
    height: 100%;
    max-width: $sidebarWidth;
    z-index: 800;
    overflow: hidden;

    /**
     * Labels inside the side panel.
     */
    label {
        color: $defaultColor;
    }

    /**
     * Form elements and blocks.
     */
    input, label, select, a,
    .sideToolbarBlock, .input-control, .button-control {
        display: inline-block;
        margin-top: 15px;
        margin-left: 10%;
        width: 80%;
    }

    /**
     * Specify colors for edit elements.
     */
    select, input[type="button"], input[type="text"],
    input[type="reset"], input[type="submit"] {
        color: $inputColor;
        background: $inputBackground;
        border: none;
    }

    /**
     * Specify styling of elements inside a block.
     */
    .sideToolbarBlock {
        input, label, button, a, select {
            margin-top: 5px;
            margin-left: 0;
            width: 100%;
        }
    }

    /**
     * Inner container, for example contact list, settings or profile.
     */
    .sideToolbarContainer__inner {
        display: none;
        height: 100%;
        width: $sidebarWidth;
        position: absolute;
        box-sizing: border-box;
        color: #FFF;

        /**
         * Titles and subtitles of inner containers.
         */
         div.title,
         div.subTitle {
            text-align: left;
            margin: 10px 0;
        }

        /**
         * Main title size.
         */
        div.title {
            color: $defaultColor !important;
            text-align: center;
            font-size: 16px;
        }

        /**
         * Subtitle specific properties.
         */
        div.subTitle {
            font-size: 11px;
            font-weight: 500;
            color: $defaultSideBarFontColor !important;
            margin-left: 10%;
        }

        /**
         * First element after a title.
         */
        .first {
            margin-top: 0 !important;
        }

        /**
         * Buttons in the side toolbar container.
         */
        .button-control {
            margin: 9px 0;
            width: 100%;
        }
    }
}

#device_settings {
    width : auto !important;
    text-align: center;
}