Minor styling tweaks.

LMS-11302

common/lib/xmodule/xmodule/css/lti/lti.scss

@@ -17,14 +17,12 @@ div.lti {
 
     .wrapper-lti-link {
         @include font-size(14);
-        position: relative;
         background-color: $sidebar-color;
-        padding: ($baseline*1.8) ($baseline*1.5) ($baseline*1.1) $baseline;
+        padding: $baseline;
 
         .lti-link {
-            position: absolute;
-            top: ($baseline*1.8);
-            right: $baseline;
+            margin-bottom: 0;
+            text-align: right;
 
             .link_lti_new_window {
                 @extend .gray-button;