Reduce width of iframe in embed code.

index.html

@@ -280,7 +280,7 @@
 
         const copyButton = document.getElementById("copy-iframe-btn");
         copyButton.addEventListener("click", () => {
-          const iframeCode = `<iframe src="https://emma.eduzs.link" width="400" height="600" frameborder="0" scrolling="no"></iframe>`;
+          const iframeCode = `<iframe src="https://emma.eduzs.link" width="300" height="600" frameborder="0" scrolling="no"></iframe>`;
           navigator.clipboard.writeText(iframeCode).then(() => {
             alert("Embed code copied to clipboard!");
           });