fix close button in firefox

css/application.css

@@ -2403,16 +2403,15 @@ div.course-wrapper.closed section.course-index {
 div.course-wrapper.closed section.course-content {
   width: 97.773%; }
 
-section.course-index {
-  position: relative; }
-  section.course-index div#open_close_accordion {
+section.course-index div#open_close_accordion {
   -webkit-box-shadow: 0 1px 0 #eeeeee;
   -moz-box-shadow: 0 1px 0 #eeeeee;
   -ms-box-shadow: 0 1px 0 #eeeeee;
   -o-box-shadow: 0 1px 0 #eeeeee;
   box-shadow: 0 1px 0 #eeeeee;
   border-bottom: 1px solid #d3d3d3;
-    padding: 0 22.652px; }
+  padding: 0 22.652px;
+  position: relative; }
   section.course-index div#open_close_accordion h2 {
     padding-right: 20px; }
   section.course-index div#open_close_accordion a {
@@ -2421,7 +2420,7 @@ section.course-index {
     height: 16px;
     position: absolute;
     padding: 8px;
-      top: 12px;
+    top: -12px;
     right: -1px;
     border: 1px solid #D3D3D3;
     background: #eeeeee url("/static/images/slide-left-icon.png") center center no-repeat;
@@ -2432,7 +2431,7 @@ section.course-index {
     border-radius: 3px 0 0 3px; }
     section.course-index div#open_close_accordion a:hover {
       background-color: white; }
-  section.course-index div#accordion h3, section.course-index div#accordion div#wiki_panel input[type="button"], div#wiki_panel section.course-index div#accordion input[type="button"] {
+section.course-index div#accordion h3, section.course-index div#accordion div#wiki_panel input[type="button"], div#wiki_panel section.course-index div#accordion input[type="button"] {
   overflow: hidden;
   margin: 0; }
   section.course-index div#accordion h3:last-child, section.course-index div#accordion div#wiki_panel input[type="button"]:last-child, div#wiki_panel section.course-index div#accordion input[type="button"]:last-child {
@@ -2449,7 +2448,7 @@ section.course-index {
     section.course-index div#accordion h3.ui-accordion-header.ui-state-hover, section.course-index div#accordion div#wiki_panel input.ui-accordion-header.ui-state-hover[type="button"], div#wiki_panel section.course-index div#accordion input.ui-accordion-header.ui-state-hover[type="button"] {
       border: none;
       border-bottom: 1px solid #d3d3d3; }
-  section.course-index div#accordion ul.ui-accordion-content {
+section.course-index div#accordion ul.ui-accordion-content {
   -webkit-border-radius: 0;
   -moz-border-radius: 0;
   -ms-border-radius: 0;