*{
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body{
    width: 100vw;
    height: 100vh;

    background-color: lightgray;

    display:grid;
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;


}

header{
    min-height: 50px;

    background-color: cadetblue;
}

main{
    overflow: hidden;
}

main .content{
    width: 100%;
    height: 100%;
}