update usage with delete_on_download, let it scroll on narrow screens

static/index.css

@@ -83,4 +83,5 @@ a.button:visited {
 
 .usage {
   margin-top: 2em;
+  overflow: auto;
 }

template/index.html

@@ -46,7 +46,9 @@ text upload
   curl -F 'text=your text' {upload_url}
 including time
   curl -F 'text=your text' -F 'keep_for=1800' {upload_url}
-        </pre>
+limit to one download
+  curl -F 'text=your text' -F 'delete_on_download=true' {upload_url}</pre
+        >
       </section>
     </main>
   </body>