.grid_container {
    display: grid;
    grid-template-columns: 1fr 3fr 1fr;
    column-gap: 30px;
}

header {
    grid-column: span 3;
    text-align: center;
    border-bottom: 2px solid gray;
}

article img {
    width: 100%;
}

footer {
    grid-column: span 3;
    text-align: center;
    border-top: 2px solid gray;
}