Update admin.css

src/static/web/css/admin.css

@@ -532,7 +532,7 @@ body.hidemenu .body-right {
 	font-size:12px
 }
 .btn-xs {
-	padding:0.2rem;
+	padding:0.22rem;
 	height:20px;
 	line-height:1;
 	font-size:12px;