jitsi-meet/css/_mini_toolbox.scss

.always-on-top-toolbox {
    background-color: $newToolbarBackgroundColor;
    border-radius: 3px;
    display: flex;
    z-index: $toolbarZ;

    .toolbox-icon {
        cursor: pointer;
        padding: 7px;
        width: 22px;
        height : 22px;

        &.toggled {
            background: none;
        }

        &.disabled {
            cursor: initial;
        }
    }
}

.always-on-top-toolbox {
    flex-direction: row;
    left: 50%;
    position: absolute;
    bottom: 10px;
    transform: translateX(-50%);
    padding: 3px !important;
}