fix copy selection

assets/base.scss

@@ -478,6 +478,7 @@ header {
   pointer-events: none;
   transition: opacity 0.2s ease, transform 0.2s ease;
   transition-delay: 0.3s;
+  user-select: none;
 
   &.visible {
     opacity: 1;
@@ -492,4 +493,4 @@ header {
     margin: 0;
     font-weight: 400;
   }
-}
+}