Remove inline-block, not needed at all

www/searchCSS.css

@@ -22,7 +22,6 @@
     font-size: 1.5em;
     height: 31px;
     padding: 2px 0 0 8px;
-    display:inline-block;
 }
 #searchform input.gsc-search-button {
     -moz-border-radius: 5px;