demo.css

:root {
  --box-size: 128px;
  --column-count: 11;
}

body {
  font-family: "helvetica neue", helvetica, arial;
  font-weight: bold;
  margin: 0;
  padding: 0;
  font-size: 18px;
  color: white;
}

ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

li {
  display: block;
}

ul.palettes {
  width: calc(var(--column-count) * var(--box-size));
  margin: 0 auto;
  text-align: center;
}

ul.palettes.heading > li {
  color: #000 !important;
  opacity: 0.5;
  margin: 0;
  height: 30px;
}

ul.palettes > li {
  display: inline-block;
  margin: 80px 0;
  height: var(--box-size);
}

ul.swatches {
  float: none;
  clear: both;
  overflow: hidden;
}

ul.swatches > li {
  width: var(--box-size);
  height: var(--box-size);
  line-height: var(--box-size);
  float: left;
  text-align: center;
  /* border-radius: 100%; */
} 

ul.swatches > li img {
  width: 100%;
  height: 100%;
}

ul.swatches > li.picked, ul.swatches > li.icon {
  margin-left: var(--box-size);
}

/* li > div {
  float: left;
  width: 150px;
  height: 150px;
  line-height: 150px;
  text-align: center;
  color: white;
} */