Do not show button if clipboard not available

assets/templates/html/pasteMeta.html.tmpl

@@ -7,7 +7,7 @@
 {{end}}
 
 {{define "body"}}
-<pre>
+<pre id="copyToClipboardContainer" class="hidden">
 <button onclick="copyToClipboard('{{.RootURL}}/{{.Paste.Key}}{{.FileExt}}')">Copy URL to clipboard</button> <span id="copyToClipboardStatus"></span>
 </pre>
 <pre>