/* RESET */
* {
    box-sizing: border-box;
    padding: 0;
    margin: 0;
}
.container, 
.content {
    display: flex;
    flex-direction: column;
}
@media all and (min-width: 768px) {
    .content {
        flex-direction: row;
        flex-wrap: wrap;
    }
    main {
        flex: 2;
        order: 2;
        min-height: 80vh;
    }
    .left-sidebar {
        order: 1;
        flex: 1;
    }
    .right-sidebar {
        flex: 1;
        order: 3;
    }
}
/* COLORS and FONTS */
body {
    color: white;
    text-align: center;
    font-size: 24px;
    line-height: 3;
}
header {
    background: orangered;
}
main {
    background: darkslateblue;
}
footer {
    background: deeppink;
}
.left-sidebar {
    background: dodgerblue;
}
.right-sidebar {
    background: forestgreen;
}