এইচটিএমএল
<div class="parent">
<div class="box">1</div>
<div class="box">2</div>
<div class="box">3</div>
</div>
সিএসএস
.parent {
display: flex;
flex-wrap: wrap;
justify-content: center;
}
.box {
/* Stretching: */
flex: 1 1 150px;
margin: 5px;
background: red;
gap: 1rem;
}