#wrapper{
    display:grid; 
    grid-template-columns: 1fr 1fr; 
    grid-template-rows: 100px 200px 250px 100px; 
}
nav{
grid-column:1 / 4; 
border:black solid;
padding-bottom:20px; 
grid-row:
}
main{
grid-column:1 / 4 ; 
border:black solid; 
}

header{
    border:black solid; 
    grid-column:1 / -1; 
}
footer{
    grid-column:1 / -1;
    border:black solid; 
}