diff --git a/src/xterm.css b/src/xterm.css
index 435cf0ee..bf1442de 100644
--- a/src/xterm.css
+++ b/src/xterm.css
@@ -61,6 +61,7 @@
     position: absolute;
     opacity: 0;
     left: -9999em;
+    top: -9999em;
     width: 0;
     height: 0;
     z-index: -10;