<style>
.grid {
    float: left;
    display: grid;
    grid-template-columns: auto;
    grid-template-rows: auto;
}

.first {
    background: pink;
    border: 1px solid black;
    min-width: 100px;
    min-height: 100px;
}

.second {
    background: skyblue;
    border: 1px solid black;
    min-width: 100px;
    min-height: 100px;
}
</style><div class="grid"><div class="first">first</div><div class="second">second</div></div>