Add more space between buttons

Author: chuckwagoncomputing

apps/worldclkinfo/custom.html

@@ -21,7 +21,7 @@
 
     <button id="addrow" class="btn">+</button>
     <button id="delrow" class="btn">-</button>
-    <br>
+    <br><br><br>
     <button id="upload" class="btn btn-primary">Upload</button>
     <template id="row-template">
       <tr class="row">