fixed accordion nav glitch

common/lib/xmodule/xmodule/css/sequence/display.scss

@@ -10,6 +10,7 @@ nav.sequence-nav {
     position: absolute;
     top: 0;
     left: 0;
+    z-index: 9999;
     width: 20px;
     height: 46px;
     @include linear-gradient(left, rgba(0, 0, 0, .2), rgba(0, 0, 0, 0));
@@ -21,6 +22,7 @@ nav.sequence-nav {
     position: absolute;
     top: 0;
     right: 0;
+    z-index: 9999;
     width: 20px;
     height: 46px;
     @include linear-gradient(right, rgba(0, 0, 0, .2), rgba(0, 0, 0, 0));

lms/static/sass/course/base/_base.scss

@@ -26,12 +26,12 @@ a {
 }
 
 .container {
-  padding: 1.4em 0 0 0;
+  padding: 20px 0 0 0;
 
   > div {
     display: table;
+    table-layout: fixed;
     width: 100%;
-    @include box-sizing(border-box);
     border-radius: 3px;
     border: 1px solid #ccc;
     background: #fff;
@@ -39,6 +39,11 @@ a {
   }
 }
 
+
+
+
+
+
 form {
   label {
     display: block;