As resquested by @MrTimscampi + theme adjustement

src/themes/appletv/theme.css

@@ -188,7 +188,8 @@ html {
 }
 
 .appfooter,
-.formDialogFooter:not(.formDialogFooter-clear) {
+.formDialogFooter:not(.formDialogFooter-clear),
+.playlistSectionButton {
     color: rgba(0, 0, 0, 0.7);
     background: #303030;
     background: -webkit-gradient(linear, left top, right top, from(#bcbcbc), color-stop(#a7b4b7), color-stop(#beb5a5), color-stop(#adbec2), to(#b9c7cb));

src/themes/blueradiance/theme.css

@@ -181,7 +181,8 @@ html {
     color: rgba(255, 255, 255, 0.87);
 }
 
-.appfooter {
+.appfooter,
+.playlistSectionButton {
     background: #033664;
     color: #ccc;
     color: rgba(255, 255, 255, 0.78);

src/themes/dark/theme.css

@@ -163,7 +163,8 @@ html {
     color: rgba(255, 255, 255, 0.87);
 }
 
-.appfooter {
+.appfooter,
+.playlistSectionButton {
     background: #202020;
     color: #ccc;
     color: rgba(255, 255, 255, 0.78);

src/themes/light/theme.css

@@ -185,7 +185,8 @@ html {
     color: rgba(255, 255, 255, 0.87);
 }
 
-.appfooter {
+.appfooter,
+.playlistSectionButton {
     background: #282828;
     color: #ccc;
     color: rgba(255, 255, 255, 0.78);

src/themes/purplehaze/theme.css

@@ -271,7 +271,8 @@ a[data-role=button] {
     color: rgba(255, 255, 255, 0.87);
 }
 
-.appfooter {
+.appfooter,
+.playlistSectionButton {
     background: #06256f;
     color: #ccc;
     color: rgba(255, 255, 255, 0.78);

src/themes/wmc/theme.css

@@ -174,7 +174,8 @@ html {
 }
 
 .appfooter,
-.formDialogFooter:not(.formDialogFooter-clear) {
+.formDialogFooter:not(.formDialogFooter-clear),
+.playlistSectionButton {
     background: #0c2450;
     background: -webkit-gradient(linear, left bottom, left top, from(#0c2450), to(#081b3b));
     background: -webkit-linear-gradient(bottom, #0c2450, #081b3b);