.grid-container {
    border: 2px solid green;
    height: 300px;
    width: 500px;
    display: grid;
    grid-template-columns: 100px 60px 60px;
    /* grid-template-rows: 20px 20px; */
    gap: 5px 10px;
}

.grid-item {
    border: 1px solid red;
}

.grid-container > div:nth-child(7) {
    border: 2px solid blue;
    grid-row: 1 / 2;
    grid-column: 3 / 4;
}