<style>
.container {
    display: grid;
    background-color: lightsalmon;
    grid-template-columns: fit-content(150px) fit-content(150px);
}

.one {
    background-color: lightblue;
}

.two {
    background-color: yellowgreen;
}
</style><div class="container"><div class="one">1</div><div class="two">2</div></div>