/* RESET */

html, body, div, span, h1, h2, h3, p, ul, li, img, a {
    margin: 0;
    padding: 0;
    border: 0;
}

* {
    box-sizing: border-box;
}

/* TYPOGRAPHY */

body {
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    color: #333;
    font-size: 14px;
    line-height: 1.6;
}

/* LAYOUT */

body {
    display: grid;
    grid-template-columns: 1fr 40rem 1fr;
    max-width: 80rem;
    width: 100%;
    margin: 0 auto;
    border-left: 1px solid #ccc;
    border-right: 1px solid #ccc;
}

#header {
    grid-column: 1 / span 3;
    padding: 1.5em;
}

#menu {
    grid-column: 1 / span 3;
    background-color: blue;
}

#content {
    grid-column: 2;
    grid-row: 3;
    padding: 1em;
}

#aside_one {
    grid-column: 1;
    grid-row: 3;
    padding: 1em;
    background-color: #efefef;
    border-right: 1px solid #ccc;
}

#aside_two {
    grid-column: 3;
    grid-row: 3;
    padding: 1em;
    background-color: #efefef;
    border-left: 1px solid #ccc;
}

#footer {
    grid-column: 1 / span 3;
    padding: 1em;
    background-color: #333;
    text-align: center;
}


/* #menuIGATION */

#menu ul {
    display: flex;
    list-style-type: none;
}

#menu li {
    padding: 0 1em;
}

#menu a:hover, footer a:hover {
    border-bottom: 1px solid #fff; 
}

#menu a, footer a {
    text-decoration: none;
    color: #fff;
}

a {
    color: inherit;
    text-decoration: none;
}


/* IMAGES */

img {
    width: 100%;
}

#content img.left {
    float: left;
    width: 33%;
    margin-right: 2em;
    margin-bottom: 1em;
}

#aside_one img {
    margin-bottom: 1em;
}

/* RESPONSIVE */

@media (max-width: 768px) {
    body {
        grid-template-columns: 1fr;
    }

    #aside_one,
    #aside_two {
        grid-column: 1;
        border: none;
    }

    #content img.left {
        float: none;
        width: 100%;
        margin-right: 0;
    }
}