Fixed some buttons being selectable

style.css

@@ -319,6 +319,7 @@ body.dark .custom-category div {
   background: #222;
 }
 .custom-header-static {
+  user-select: none;
   font-size: 250%;
   margin: 10px;
   display: inline-block;
@@ -333,6 +334,7 @@ body.dark .custom-header-static {
 }
 
 .custom-header {
+  user-select: none;
   font-size: 250%;
   margin: 10px;
   display: inline-block;