* {
    padding: 0;
    margin: 0;
}

.container {
    display: grid;
    grid-template-columns: 240px 1fr 240px;
    grid-template-rows: auto 1fr auto;
    min-height: 100vh;
}

header{
    background-color: #d1fa9b;
    height: 80px;
    grid-column: span 3;
}

footer{
    background-color: #000;
    color: #fff;
    height: 80px;
    grid-column: span 3; 
}

nav{
    background-color: #043802;
    color: #fff;
}

aside{
    background-color: #6b8e23;
}

@media (max-width: 780px) {
    .container{
        display: flex;
        flex-direction: column;
    }

    nav{
        height: 80px;
    }

    aside{
        flex-direction: row;
    }

    article{
        flex-direction: row;
    }
}