diff --git a/lib/weblib.php b/lib/weblib.php
index 812af323e2f..3126c0a1b3f 100644
--- a/lib/weblib.php
+++ b/lib/weblib.php
@@ -3632,7 +3632,7 @@ function print_side_block_start($heading='', $attributes = array()) {
     if ($heading) {
         echo '<tr><th class="sideblockheading">'.$heading;
         if (!empty($CFG->allowuserblockhiding)) {
-            echo '<div class="hide-show"><a href="#" onclick="elementToggleHide(this, true, function(el) {return findParentNode(el, \'TABLE\', \'sideblock\'); } ); return false;"><img src="'.$CFG->pixpath.'/spacer.gif" alt="" height="11" width="11" class="hide-show-image" /></a></div>';
+            echo '<div class="hide-show"><a href="#" onclick="elementToggleHide(this, true, function(el) {return findParentNode(el, \'TABLE\', \'sideblock\'); } ); return false;"><img src="'.$CFG->pixpath.'/spacer.gif" alt="" class="hide-show-image" /></a></div>';
         }
         echo '</th></tr>';
     }
diff --git a/theme/standard/styles_layout.css b/theme/standard/styles_layout.css
index f9d588cb5ee..73cf476248a 100644
--- a/theme/standard/styles_layout.css
+++ b/theme/standard/styles_layout.css
@@ -732,6 +732,8 @@ table.calendar-controls .next
 }
 
 .sideblockheading .hide-show img.hide-show-image {
+    height:11px;
+    width:11px;
     margin-top:0.25em;
 }