Set color for header and sidebar with modal-header-color and modal-bg-color respectively

CSS/themes/jellyfin/jellyfin-base.css

@@ -95,6 +95,14 @@ html {
     -o-background-size: auto, cover;
 }
 
+.headerTop {
+	background-color: var(--modal-header-color);
+}
+
+.mainDrawer-scrollContainer {
+	background-color: var(--modal-bg-color);
+}
+
 .appfooter,
 .formDialogFooter:not(.formDialogFooter-clear) {
     background: var(--footer-background);
@@ -882,6 +890,10 @@ html {
     color: rgb(var(--theme-accent-text-color));
 }
 
+.emby-tabs-slider{
+	background-color: var(--modal-header-color);
+}
+
 .guide-channelHeaderCell:focus,
 .programCell:focus {
     background-color: rgb(var(--theme-accent-text-color)) !important;