diff --git a/404.html b/404.html
index 20380e4..2e2cd3a 100644
--- a/404.html
+++ b/404.html
@@ -11,6 +11,18 @@
         body {
             font-family: 'Inter', sans-serif;
             margin: 0;
+            -webkit-touch-callout: none;
+            /* iOS Safari */
+            -webkit-user-select: none;
+            /* Chrome/Safari/Opera */
+            -khtml-user-select: none;
+            /* Konqueror */
+            -moz-user-select: none;
+            /* Firefox */
+            -ms-user-select: none;
+            /* Internet Explorer/Edge */
+            user-select: none;
+            /* Non-prefixed version, currently not supported by any browser */
         }
 
         .center {
diff --git a/index.html b/index.html
index a833bea..f8837fd 100644
--- a/index.html
+++ b/index.html
@@ -11,6 +11,18 @@
         body {
             font-family: 'Inter', sans-serif;
             margin: 0;
+            -webkit-touch-callout: none;
+            /* iOS Safari */
+            -webkit-user-select: none;
+            /* Chrome/Safari/Opera */
+            -khtml-user-select: none;
+            /* Konqueror */
+            -moz-user-select: none;
+            /* Firefox */
+            -ms-user-select: none;
+            /* Internet Explorer/Edge */
+            user-select: none;
+            /* Non-prefixed version, currently not supported by any browser */
         }
 
         .center {