Fix connection warning

client/stylesheets/base.less

@@ -59,6 +59,23 @@ code {
 	font-weight: bold;
 }
 
+.text-center {
+	text-align: center;
+}
+
+.alert {
+	padding: 15px;
+	margin-bottom: 20px;
+	border: 1px solid rgba(0, 0, 0, 0);
+	border-radius: 4px;
+}
+
+.alert-warning {
+	color: #8A6D3B;
+	background-color: #FCF8E3;
+	border-color: #FAEBCC;
+}
+
 .hidden {
 	visibility: hidden !important;
 	display: none !important;