Adjust CSS image-replacement

Make sure that any text-highlight, or other factors that may break the
illusion, are far enough outside the element to be unnoticed.

Fix h5bpgh-1239

Author: necolas

CHANGELOG.md

@@ -1,5 +1,6 @@
 ### HEAD
 
+* Adjust CSS image-replacement code ([#1239](https://github.com/h5bp/html5-boilerplate/issues/1239)).
 * Update HiDPI example media query ([#1127](https://github.com/h5bp/html5-boilerplate/issues/1127)).
 
 ### 4.0.2 (9 December, 2012)

css/main.css

@@ -129,7 +129,7 @@ textarea {
     content: "";
     display: block;
     width: 0;
-    height: 100%;
+    height: 150%;
 }
 
 /*