Basic colors for simple App layout.

App.css

.App {
  background-color: black;
}

.App .header {
  background-color: blue;
}

.App .body {
  background-color: red;
}

.App .body .content {
  background-color: green;
}

.App .body .sidebar {
  background-color: yellow;
}

.App .footer {
  background-color: grey;
}

.App:after,
.App .header:after,
.App .body:after,
.App .body .content:after,
.App .body .sidebar:after,
.App .footer:after {
  content: '\00a0';
}