<style>
.grid-container {
    display: grid;
    background-color: lightsalmon;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    grid-template-areas: "one one three two";
}

.grid-item {
    background-color: lightblue;
    grid-column-start: one;
    grid-column-end: one;
}
</style><div class="grid-container"><div class="grid-item">1fr</div></div>