container{
}
    .sidebar{
        width: 30%;
        height: 100px;
        border: 1px solid black;

    }
        section{
            width: 70%;
            height: 100px;
            border: 1px solid blue;

        }


        @media screen and (max-width:600px){
            .container{
                display: block{

                }
            }
        }