/* Three columns: 100px each */

.grid-container {
    display: grid;
    grid-template-columns: 0.5fr 0.5fr;
    grid-template-rows: calc(100vh);
    grid-gap: 1rem;
    margin: 0rem;
}

.editor-container {
    height: calc(100vh)
}

/* Three columns: 100px each */

.grid-container {
    display: grid;
    grid-template-columns: 0.5fr 0.5fr;
    grid-template-rows: calc(100vh);
    grid-gap: 1rem;
    margin: 0rem;
}

#editor-container > div {
    height: calc(100vh)
}

Make editor the full viewport height
Make editor the full viewport height
