src/themes/audio_player/default/message.scss
.#{$css}-message-container {
@include absolute-align-all;
background-color: $message_bgcolor;
opacity: $message_opacity;
}
.#{$css}-message-message {
@include transform-translate-y(-50%);
color: $message_color;
position: absolute;
left: 5px;
right: 5px;
top: 50%;
text-align: center;
}