Minor CSS: increase input padding on captcha page

anonstream/templates/captcha.html

@@ -33,7 +33,7 @@
       border-radius: 2px;
       color: #ddd;
       font-size: 14pt;
-      padding: 1px 3px;
+      padding: 4px 5px;
       width: 10ch;
     }
     input[name="answer"]:hover {