.sm2-bar-ui {
 font-size: 20px;
}
.sm2-bar-ui .sm2-main-controls,
.sm2-bar-ui .sm2-playlist-drawer {
 background-color: #ff0000; /* non-RGBA fallback */
 background-color: rgba(255, 0, 0, 0.92);
}
.sm2-bar-ui .sm2-inline-texture {
 background: transparent;
}