body {
    display: grid;
    grid-template-columns: 1fr 1fr; /* two equal columns */
    grid-template-rows: auto;
    align-items: start;
}

/* static image on the left - sticks in place while right side scrolls */
#side-image {
    grid-column: 1;
    grid-row: 1 / 999; /* spans all rows */
    position: sticky;
    top: 0;
}

/* everything on the right side */
h1, h3, form {
    grid-column: 2;
}