Add project files.

ConstructorAppUI/wwwroot/AdminTheme/build/scss/pages/_invoice.scss

@@ -0,0 +1,19 @@
+//
+// Pages: Invoice
+//
+
+.invoice {
+  background-color: $white;
+  border: 1px solid $card-border-color;
+  position: relative;
+}
+
+.invoice-title {
+  margin-top: 0;
+}
+
+@include dark-mode () {
+  .invoice {
+    background-color: $dark;
+  }
+}