Fix alertify style which made the registration popup look bad

customize.dist/src/less2/include/alertify.less

@@ -94,6 +94,7 @@
                 background-color: @alertify-dialog-bg;
                 &.half {
                     width: 50%;
+                    max-width: 50%;
                     @media (max-width: @browser_media-medium-screen) {
                         width: 100%;
                     }