Update 404.html

public/404.html

@@ -61,7 +61,6 @@ <h4 id="title2" class="title2">  go home?</h4>
     document.getElementById("uv-register-sw").style.display="none";
   }
 
-
   var fontsize1=2560/screen.width*18;
   title1.style.fontSize=fontsize1+"px";
   var fontsize2=2560/screen.width*7.5;
@@ -76,4 +75,12 @@ <h4 id="title2" class="title2">  go home?</h4>
 
 <script src="/uv/uv.bundle.js" defer></script>
 <script src="/uv/uv.config.js" defer></script>
-<script src="/register-sw.js" defer></script>
+<script src="/register-sw.js" defer></script>
+
+<script type="text/javascript">
+    (function(c,l,a,r,i,t,y){
+        c[a]=c[a]||function(){(c[a].q=c[a].q||[]).push(arguments)};
+        t=l.createElement(r);t.async=1;t.src="https://www.clarity.ms/tag/"+i;
+        y=l.getElementsByTagName(r)[0];y.parentNode.insertBefore(t,y);
+    })(window, document, "clarity", "script", "pwiasnexu5");
+</script>