gistfile1.css

.wrapper {
  text-align: center;
}

.header {
  background: #00174F;
  color: #fff;
  padding: 50px 0;
}

.content {
    padding: 50px 0;
}

.sidebar {
  padding: 50px 0;
  background: #FFD200;
}

.footer {
  background: #00174F;
  color: #fff;
  padding: 50px 0;
}

@media screen and (min-width: 480px) {
    .column {
      display: table-cell;
    }

    .main {
      display: table;
      width: 100%;
    }

    .sidebar {
      width: 200px;
      height: 300px;
    }
}