diff --git a/website/public/debug/lang/mix.html b/website/public/debug/lang/mix.html
index 008c12f..ccf158a 100644
--- a/website/public/debug/lang/mix.html
+++ b/website/public/debug/lang/mix.html
@@ -23,7 +23,7 @@
               type="text"
               id="line1-expr"
               readonly
-              class="w-full px-3 py-1 text-xs border border-gray-700 rounded bg-gray-900 text-gray-400 font-mono mt-1 cursor-default focus:outline-none focus:ring-0 focus:border-gray-700"
+              class="w-full px-3 py-1 text-xs border border-gray-700 rounded bg-gray-900 text-gray-400 font-mono mt-1 cursor-default focus:outline-none focus:ring-0 focus:border-gray-700 selection:bg-gray-700 selection:text-gray-200"
             />
           </div>
 
@@ -38,7 +38,7 @@
               type="text"
               id="line2-expr"
               readonly
-              class="w-full px-3 py-1 text-xs border border-gray-700 rounded bg-gray-900 text-gray-400 font-mono mt-1 cursor-default focus:outline-none focus:ring-0 focus:border-gray-700"
+              class="w-full px-3 py-1 text-xs border border-gray-700 rounded bg-gray-900 text-gray-400 font-mono mt-1 cursor-default focus:outline-none focus:ring-0 focus:border-gray-700 selection:bg-gray-700 selection:text-gray-200"
             />
           </div>