fix copy button animation

docs/assets/plugins/code-block/code-block.css

@@ -179,7 +179,7 @@
 }
 
 .markdown-section .docsify-copy-code-button.copied {
-  animation: pulse 1s;
+  animation: pulse 0.75s;
   --pulse-color: rgb(var(--sl-color-neutral-500));
 }
 

docs/assets/plugins/code-block/code-block.js

@@ -202,10 +202,12 @@
   // Show pulse when copying
   document.addEventListener('click', event => {
     const button = event.target.closest('.docsify-copy-code-button');
-
     if (button) {
       button.classList.remove('copied');
-      requestAnimationFrame(() => button.classList.add('copied'));
+      requestAnimationFrame(() => {
+        button.addEventListener('animationend', () => button.classList.remove('copied'), { once: true });
+        button.classList.add('copied');
+      });
     }
   });
 })();