learn iframe fixed for nextcloud mail

app/mail/page.tsx

@@ -16,6 +16,12 @@ export default async function Page() {
           src="https://espace.slm-lab.net/apps/mail"
           className="w-full h-full border-none"
           allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
+          sandbox="allow-same-origin allow-scripts allow-popups allow-forms"
+          style={{ 
+            marginTop: '-64px',
+            marginLeft: '-250px', // Adjust this value based on the sidebar width
+            width: 'calc(100% + 250px)' // Compensate for the negative margin
+          }}
           allowFullScreen
         />
       </div>