.bit {
    max-width: 1000px;
    margin: 60px auto;
    display: grid;
    grid-gap: 10px;
    grid-template-columns: 150px auto;
}
header, nav, main, footer {border: black 2px solid;}
header {
    grid-row: 1 / 2;
    grid-column: 1 / 3;
}
nav {
    grid-row: 2 / 3;
    grid-column: 1 / 2;
    height: max-content;
}
main {
    grid-row: 2 / 3;
    grid-column: 2 / 3;
    height: max-content;
}
footer {
    grid-row: 3 / 4;
    grid-column: 1 / 3;
}