.parent {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(12, 1fr);
    grid-column-gap: 15px;
    grid-row-gap: 15px;
	width: 100vw;
    height: 100vh;
    background-size: 100% 100%;
    }
    
    .div1 { grid-area: 1 / 1 / 5 / 2; }
    .div2 { grid-area: 5 / 1 / 13 / 2; }
    .div3 { grid-area: 1 / 2 / 7 / 3; }
    .div4 { grid-area: 7 / 2 / 13 / 3; }
    .div5 { grid-area: 1 / 3 / 5 / 4; }
    .div6 { grid-area: 5 / 3 / 13 / 4; }