.fullpage {

    display: grid;
    grid-template-rows: auto auto auto ;
    grid-template-columns: 100%;
    /* grid-template-rows: 220px 750px 190px; */
    /* grid-template-columns: auto; */
}

.header { grid-row: 1/2; grid-column: 1/-1; }
.main-body { grid-row: 2/3; grid-column: 1/-1; }
.footer { grid-row: 3/4; grid-column: 1/-1;}