main class="flexContainer">
<div class="flexItem firstRow"></div>
<div class="flexItem firstRow"></div>
<div class="flexItem firstRow"></div>
<div class="flexItem firstRow"></div>
</main>
<style>
.flexContainer {
display: flex;
border: 1px solid black;
}
.flexItem {
width: 200px;
height: 200px;
}
.flexItem:first-child {
flex-shrink: 2;
}
</style>
rompera ese minimo de anchura.