body{
    margin: 0;
    height: 100vh;
}
nav{
    padding: 20px;
    float: left;
    margin: auto;
    height: 56.5vh;
    width: 20%;
}
header{
    text-align: center;
    height: 30vh;
    overflow: hidden;
}
main{
    margin: auto;
    padding: 20px;
    text-align: center;
    height: 56.5vh;
}
footer{
    padding: 20px;
    height: 2vh;
    text-align: center;
}
aside{
    padding: 20px;
    float: right;
    margin: auto;
    height: 56.5vh;
    width: 20%;
}
img{
    width: 100%; 
    height: 100%;
    display: block;
}