JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css">
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js"></script>
<div class="container-grid">
   <div class="grid-column">I'm squared</div>
   <div class="grid-column">I'm too</div>
   <div class="grid-column">yes, I'm too</div>
</div>

CSS

.grid-column {
    outline: 1px solid orange;/* for test */
}

.container-grid {
    display: grid;
    grid-auto-rows: 1fr;
    grid-template-columns: repeat(3, 1fr);
    grid-column-gap: 20px;
    grid-row-gap: 20px;
}
.container-grid .grid-column {
    aspect-ratio: 1;
    width: 100%;
}