body{
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

h1{
    margin: 0;
    padding: 0;
}

.header{
    width: 100%;
    height: 100px;
    border-radius: 20px;
    background-color: purple;
    text-align: center;
    color: white;   
}

.body-section{
    display: flex;
    margin: 10px 10px;
}

.sidebar{
    width: 15%;
    height: 530px;
    border-radius: 20px;
    background-color: skyblue;
    text-align: center;
    color: white;
}

.s2{
    background-color: seagreen;
}

.main-body{
    width: 68%;
    height: 530px;
    border-radius: 20px;
    background-color: grey;
    text-align: center;
    margin: 0 10px 0 10px;
}

.footer{
    width: 100%;
    height: 80px;
    border-radius: 20px;
    background-color: blue;
    text-align: center;
    color: white;
}

@media (max-width:770px){
    .body-section{
        display: block;
    }
    .main-body{
        width: 100%;
        height: 340px;
        margin: 10px 0 10px 0;
    }
    .sidebar{
        width: 100%;
        height: 70px;
        text-align: center;
    }
}