Add bookmark item search (#15)

- Implement form styling throughout
- Modify header links for narrower views
- Clean up CSS

src/public/user/log-on.php

@@ -26,12 +26,13 @@ page_head('Log On'); ?>
             <label>
                 E-mail Address
                 <input type=email name=email required autofocus>
-            </label><br><?php
+            </label><?php
         } ?>
         <label>
             Password
             <input type=password name=password required<?=$isSingle ? ' autofocus' : ''?>>
-        </label><br>
+        </label>
+        <span class=break></span>
         <button type=submit>Log On</button>
     </form>
 </article><?php