#gallery {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(2, 1fr);
    grid-column-gap: 0px;
    grid-row-gap: 0px;
    margin-top: 4em;
}

.gallery1 { grid-area: 1 / 1 / 3 / 2; }
.gallery2 { grid-area: 1 / 2 / 2 / 3; }
.gallery3 { grid-area: 2 / 2 / 3 / 3; }
.gallery4 { grid-area: 1 / 3 / 3 / 4; }
.gallery5 { grid-area: 1 / 4 / 2 / 5; }
.gallery6 { grid-area: 2 / 4 / 3 / 5; }