diff --git a/IPython/html/static/base/less/page.less b/IPython/html/static/base/less/page.less
index ccb210d..6f249b2 100644
--- a/IPython/html/static/base/less/page.less
+++ b/IPython/html/static/base/less/page.less
@@ -78,6 +78,12 @@ body {
 }
 
 #site {
+    // avoid repaints on size with translateZ(0)
+    -webkit-transform: translateZ(0);
+    -moz-transform: translateZ(0);
+    -ms-transform: translateZ(0);
+    -o-transform: translateZ(0);
+    transform: translateZ(0);
     width: 100%;
     display: none;
     .border-box-sizing();
diff --git a/IPython/html/static/style/style.min.css b/IPython/html/static/style/style.min.css
index 3674a93..4388dbd 100644
--- a/IPython/html/static/style/style.min.css
+++ b/IPython/html/static/style/style.min.css
@@ -8324,6 +8324,11 @@ body {
   height: 28px;
 }
 #site {
+  -webkit-transform: translateZ(0);
+  -moz-transform: translateZ(0);
+  -ms-transform: translateZ(0);
+  -o-transform: translateZ(0);
+  transform: translateZ(0);
   width: 100%;
   display: none;
   box-sizing: border-box;