user preferences - chord type - apply in song and show-song

src/app/widget-modules/components/song-text/song-text.component.less

@@ -29,7 +29,7 @@
   position: absolute;
   right: 0;
   background: #eee;
-  border-radius: 8px;
+  border-radius: 50%;
   padding: 5px;
   width: 20px;
   height: 20px;
@@ -38,7 +38,12 @@
   align-items: center;
   transition: 300ms all ease-in-out;
   cursor: pointer;
-  opacity: 0;
+  opacity: 0.1;
+
+  @media screen and (max-width: 860px) {
+    background: #0001;
+    opacity: 0.6;
+  }
 
   &:hover {
     background: #ddd;