diff --git a/biosmoother/static/css/styles.css b/biosmoother/static/css/styles.css
index 31ccc96..240a5d3 100644
--- a/biosmoother/static/css/styles.css
+++ b/biosmoother/static/css/styles.css
@@ -212,6 +212,10 @@ button {
     white-space: nowrap;
 }
 
+.z_index_100 {
+    z-index: 100;
+}
+
 .tab-button-fill{
     width: 100%;
 }
diff --git a/biosmoother/templates/index.html b/biosmoother/templates/index.html
index 9e16acc..a33ff17 100644
--- a/biosmoother/templates/index.html
+++ b/biosmoother/templates/index.html
@@ -179,7 +179,9 @@
             </div>
 
             <div id="mainNormTab" class="normTab scroll_y" style="display:block">
-                {{ embed(doc.roots.mainNorm) }}
+                <div style="z-index:100;position:relative">
+                    {{ embed(doc.roots.mainNorm) }}
+                </div>
 
                 <div class="tab-header tab-header-3">
                     <div class="tab-button tab-button-spacer tab-level-3">