<div class="square">
  <h1>Squ<br>are</h1>
</div>
<p>You get a square. And you get a square. And you get a square. Everyone gets a square.</p>
<p>Built using vmin for height and width.</p>

body {
  min-height: 100vh;
  padding: 4vmin 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.square {
  color: white;
  height: 90vmin;
  width: 90vmin;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgb(100,50,50);
}

@media all and (min-width: 600px) {
  .square {
    height: 80vmin;
    width: 80vmin;
  }
}

@media all and (min-width: 900px) {
  .square {
    height: 70vmin;
    width: 70vmin;
  }
}

h1 {
  text-transform: uppercase;
  font-family: Inconsolata, monospace;
  font-weight: 700;
  font-size: 6vmin;
  letter-spacing: .6vmin;
  line-height: 1.25;
  font-weight: 300;
}

p {
  color: rgb(130,110,110);
  max-width: 30em;
  line-height: 1.4;
  text-align: center;
  margin-top: 2em;
  margin-bottom: .5em;
}

p:last-of-type {
  font-family: Inconsolata;
  font-size: .7em;
  color: rgb(150,150,150);
  margin-top: 0;
}