piskel/dev/css/toolbox-palettes-list.css

.palettes-list-container {
  min-height: 100px;
  display: flex;
  flex-direction: column;
}

.palettes-title {
  flex-shrink: 0;
  background-size: 22px;
  background-repeat: no-repeat;
  background-position: 97%;
}

/**
 * Palettes action buttons
 */

.palettes-list-container .toolbox-buttons {
  background-color: #3f3f3f;
  height: 24px;
  padding: 0;
}

.palettes-list-button,
.palettes-list-select {
  margin: 0;
  float: left;
}

.palettes-list-button {
  width: 16.66667%;
}

.palettes-list-select {
  width: 66.66667%;
  height: 100%;
  padding: 0 5px 0 5px;

  color: #aaa;
  font-size : 0.75em;

  text-align:left;
  font-weight: normal;

  transition : background-color 0.3s, color 0.3s;
  cursor:pointer;
}

.palettes-list-select:hover,
.palettes-list-select:focus {
  background-color: #484848;
  color: white;
}

.palettes-list-select:focus {
  outline: none;
}

/*
 * Palette colors list
 */

.palettes-list-colors {
  height: 100%;
  max-height: 160px;
  overflow: auto;
  padding-top: 5px;
}

.palettes-list-color {
  cursor: pointer;
  float: left;
  margin: 0 0 5px 5px;
  width: calc((100% - 30px) / 5);
  height: 32px;
  position: relative;
}

.palettes-list-color div {
  height: 100%;
}

/*
 * Placeholder when no color is available in the current palette
 */

.palettes-list-no-colors {
  height: 35px;
  line-height: 35px;
  width: 100%;
  color: gray;
  font-size: 0.7em;
  font-style: italic;
  text-align: center
}

/*
 * Primary and secondary color markers
 */

.palettes-list-primary-color:before, .palettes-list-secondary-color:before {
  content: "";
  position: absolute;
  bottom: 1px;
  display: inline-block;
  background: url('data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20height%3D%2215%22%20width%3D%2215%22%3E%3Cpath%20stroke%3D%22gold%22%20stroke-width%3D%222%22%20d%3D%22M1%203v10h10z%22/%3E%3C/svg%3E');
  width: 14px;
  height: 14px;
}

.palettes-list-primary-color:before {
  left: 1px;
}

.palettes-list-secondary-color:before {
  right: 1px;
  background: url('data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20height%3D%2215%22%20width%3D%2215%22%3E%3Cpath%20stroke%3D%22gold%22%20stroke-width%3D%222%22%20d%3D%22M3%2013h10V3z%22/%3E%3C/svg%3E');
}

/*
 * Color index for the 9 first colors
 */

.palettes-list-color:nth-child(-n+10):after {
  position: absolute;
  top: 0;
  right: 0;

  background-color: black;
  color: var(--highlight-color);

  font-family: Tahoma;
  font-size: 0.5em;
  font-weight: bold;

  padding: 2px 3px 2px 3px;
  border-radius: 0 0 0 2px;
}

.palettes-list-color:nth-child(1):after {
  content: "1";
}

.palettes-list-color:nth-child(2):after {
  content: "2";
}

.palettes-list-color:nth-child(3):after {
  content: "3";
}

.palettes-list-color:nth-child(4):after {
  content: "4";
}

.palettes-list-color:nth-child(5):after {
  content: "5";
}

.palettes-list-color:nth-child(6):after {
  content: "6";
}

.palettes-list-color:nth-child(7):after {
  content: "7";
}

.palettes-list-color:nth-child(8):after {
  content: "8";
}

.palettes-list-color:nth-child(9):after {
  content: "9";
}