HEADER SECTION

MAIN SECTION

STEP 1

The entire section has to be addressed as a grid.

                        
    .grid-layout{
        display: grid;
        grid-template-columns: repeat(12, 1fr);
    }

    main{
        background-color: #81CCF3;
        grid-column: 4 / 13;
        grid-row: 2 / 8;
    }
STEP 2

As the sections get laid out the positioning is set up by the column and row line numbers.

                        
        main{
            background-color: #81CCF3;
            grid-column: start line number / end line number;
            grid-row: start line number / end line number;
        }

SECTION BLOCK

                
    section{
        background-color: #3e7327;
        grid-column: 1 /13;
        grid-row: 5 /6;
        width: auto;
    }
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