div {
      background-color: red;
    }
    
    
      .header {
        display: flex;
        justify-content: center;
      }
      
      .container {
        display: flex;
        flex-direction:row;
        width: 100%;
        background-color:#ffff0000;
      }
      
      .sidebar {
        display: flex;
        flex-direction: column;
        width: 25%;
        margin: 2%;
        padding: 2%;
      }
      
      .main {
        display: flex;
        flex-direction: column;
        width: 67%;
        margin:2%;
        padding: 2%;
      }
      
      footer {
        margin: 2%;
        padding: 2%;
        background-color: red;
      }