.header {
    grid-area: header;
    border: 1px solid black;
    font-family: Arial, Helvetica, sans-serif;
    background-color: lightcoral;
    color: white;
    font-size: xx-large;
    font-weight: bold;
    text-align: center;
}

.header p {
    margin-bottom: 20px;
    margin-top: 20px
}

.aside {
    grid-area: aside;
    border: 1px solid black;
    font-family: Arial, Helvetica, sans-serif;
    background-color: yellow;
    padding-right: 10px;
    padding-left: 10px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;  
    gap: 10px;
}

.aside > div {
    background-color: white;
    border: 2px solid red;
    width: 150px;
}

.aside h3 {
    margin-bottom: 0px;
}

.aside p {
    margin-top: 0px;
}

.nav {
    grid-area: nav;
    border: 1px solid black;
    font-family: Arial, Helvetica, sans-serif;
    background-color: rgb(124, 252, 0);
    padding: 10px;
}

.nav > div {
    background-color: white;
    border: 2px solid black;
    padding: 10px;
    padding-top: 20px;
    padding-bottom: 20px;
}

.nav h3 {
    margin-top: 0;
    margin-bottom: 5px;
}

.nav p {
    margin-top: 0px;
    margin-bottom: 0px;
}

.article {
    grid-area: article;
    border: 1px solid black;
    font-family: Arial, Helvetica, sans-serif;
    padding: 10px;
}

.article > img {
    width: 100px;
    height: auto;
    border: 2px solid black;
}

.article h3 {
    margin-bottom: 5px;
}

.article h4 {
    margin-top: 0px;
    margin-bottom: 0px;
}

.article p {
    margin-top: 0px;
}

.footer {
    grid-area: footer;
    border: 1px solid black;
    font-family: Arial, Helvetica, sans-serif;
    background-color: gray;
}

#big {
    font-size: xx-large;
}

.footer p {
    text-align: center;
}

.grid-container {
    width: 800px;
    margin-right: auto;
    margin-left: auto;
    border: 1px solid black;
    display: grid;
    grid-template-columns: 200px 400px 200px;
    grid-template-areas:
        'header header aside'
        'nav article aside'
        'nav article aside'
        'nav article aside'
        'nav article aside'
        'footer footer footer';
}