Make email not required for customer/vendor

public/css/app.css

@@ -498,6 +498,18 @@ ul.add-new.nav.navbar-nav.pull-left {
         background-color: #ffffff;
     }
 }
+
+.text-disabled {
+    opacity: 0.4;
+}
+
+.tooltip > .tooltip-inner {
+    background-color: #6da252;
+}
+
+.tooltip.right .tooltip-arrow {
+    border-right-color: #6da252 !important;
+}
 /*
 .content-wrapper {
     overflow: inherit;