saas-one/frontend/operation-web/ext/modern/theme-neptune/sass/src/Mask.scss

.#{$prefix}mask {
    opacity: $mask-opacity;
    background-color: $mask-background-color;

    .#{$prefix}mask-message {
        color: $mask-message-color;
    }

    @if ($mask-page-opacity != $mask-opacity) or
            ($mask-page-background-color != $mask-background-color) {
        #ext-viewport > &,
        .#{$prefix}float-wrap > & {
            opacity: $mask-page-opacity;
            background-color: $mask-page-background-color;
        }
    }
}