responsive-layout.css

div {
    margin: 10px;
}

.header{
    height: 100px;
    background-color: pink;
    border: 1px solid red;
}

.body{
    margin-left: 0px;
    margin-right: 0px;
    display: inline;
}

.navbar{
    background-color: yellow;
    border: 1px solid brown;
    @media only screen and (max-width: 800px){
        height: 160px;
    }
    @media only screen and (min-width: 800px){
        height: 400px;
        width:16%;
        margin-right: 0px;
        display: inline-block;
    }
}

.content {
    background-color: skyblue;
    border: 1px solid blue;
    @media only screen and (max-width: 800px){
        height: 240px;
    }
    @media only screen and (min-width: 800px){
        height: 400px;
        width:80%;
        margin-left: 0px;
        display: inline-block;
    }
}

.footer{
    height: 150px;
    background-color: lightgreen;
    border: 1px solid green;
}