JSFiddle - React, Tailwind, and code Playground

by Alexandru Gatea

HTML

<h1>height same as width. pure css. no js</h1>

<p>
  we need a grid system, and each card is contained in each cell.
</p>

<p>the cell will have red border, the actual card will have black border</p>


<div class="grid">
  <div class="cell">
    <div class="box">

      <div class="content">What goes inside the card</div>

    </div>
  </div>
  <div class="cell">
    <div class="box"></div>
  </div>
  <div class="cell">
    <div class="box"></div>
  </div>
  <div class="cell">
    <div class="box"></div>
  </div>
  <div class="cell">
    <div class="box"></div>
  </div>
  <div class="cell">
    <div class="box"></div>
  </div>
  <div class="cell">
    <div class="box"></div>
  </div>
  <div class="cell">
    <div class="box"></div>
  </div>
  <div class="cell">
    <div class="box"></div>
  </div>
  <div class="cell">
    <div class="box"></div>
  </div>
  <div class="cell">
    <div class="box"></div>
  </div>
  <div class="cell">
    <div class="box"></div>
  </div>
</div>

CSS

/*  you don't need these */

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  padding: 100px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  grid-gap: 50px;
  margin-top: 100px;
}

.cell {
  width: 100%;
  border: 1px solid red;
  padding: 10px;
  height: 100%;
}

/* you need this */
/* This is the magic trick */

/* IMPORTANT. THE BOX IS POSITION: RELATIVE */
.box {
  position: relative;
  width: 100%;
  border: 1px solid black;
  
  /* I lied. this is the trick */
  height: 0px;
  padding-bottom: 100%;

}

/* IMPORTANT: THE CONTENT IS ABSOLUTE */
.content {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}