Give page darker background

app/javascript/packs/frontend/assets/stylesheets/app.scss

@@ -4,8 +4,12 @@ $border-radius: 0 !default;
 $border-radius-lg: 0 !default;
 $border-radius-sm: 0 !default;
 
+html,
+body,
 main#app {
-  //background-color: #dfdfdf;
+  height: 100%;
+  background-color: #424242;
+  color: #fff;
 }
 
 @import '~bootstrap/scss/bootstrap.scss';