diff --git a/web/alert/index.js b/web/alert/index.js
index 48ecc49..9f1aa53 100644
--- a/web/alert/index.js
+++ b/web/alert/index.js
@@ -12,7 +12,7 @@ $(async function () {
             $(audio).on("loadedmetadata", function() {
                 resolve(audio);
             });
-            audio.volume = volume/100.0;
+            audio.volume = Math.max(1,Math.min(0,volume/100.0));
             audio.src = src;
             audio.play().catch((err)=>{
                 if(err.toString().startsWith('NotAllowedError')){
@@ -34,7 +34,7 @@ $(async function () {
         let audio = await playAudio(music);
         node.style.opacity = 1;
         nodeIm.style.opacity = 1;
-        await sleep(audio.duration*1000 - 1000);
+        await sleep(Math.max(audio.duration*1000 - 500,3000));
         node.style.opacity = 0;
         nodeIm.style.opacity = 0;
     }