diff --git a/resources/servo.css b/resources/servo.css
index 1fa54c8b816..37fe28f9847 100644
--- a/resources/servo.css
+++ b/resources/servo.css
@@ -1,6 +1,7 @@
 input, textarea, select { display: inline-block; }
 input                   { background: white; min-height: 1.0em; padding: 0em; padding-left: 0.25em; padding-right: 0.25em; border: solid lightgrey 1px; color: black; white-space: nowrap; }
 textarea                { background: white; min-height: 1.0em; padding: 0em; padding-left: 0.25em; padding-right: 0.25em; border: solid lightgrey 1px; color: black; white-space: pre; }
+button,
 input[type="button"],
 input[type="submit"],
 input[type="reset"]     { background: lightgrey; border-top: solid 1px #EEEEEE; border-left: solid 1px #CCCCCC; border-right: solid 1px #999999; border-bottom: solid 1px #999999; text-align: center; vertical-align: middle; color: black; width: 100%; }