/* Style the top bar button */
#wp-admin-bar-mwm_open_app {
    line-height: normal !important;
    padding: 0 !important;
}
#wp-admin-bar-mwm_open_app .ab-item {
    display: inline-flex !important;
    align-items: center !important;
    background-color: #7c3aed !important;
    color: #fff !important;
    padding: 0 10px !important;
}
#wp-admin-bar-mwm_open_app .ab-item:hover {
    background-color: #7c3aed !important;
    color: #fff !important;
}
#wp-admin-bar-mwm_open_app:hover .ab-icon:before,
#wp-admin-bar-mwm_open_app:focus .ab-icon:before,
#wp-admin-bar-mwm_open_app a:hover .ab-icon:before,
#wp-admin-bar-mwm_open_app a:focus .ab-icon:before {
    color: #fff !important;
}