element-plus/website/demo-styles/color-picker.scss

.demo-color-picker .block {
  padding: 30px 0;
  text-align: center;
  border-right: solid 1px var(--el-border-color-base);
  display: inline-block;
  width: 50%;
  box-sizing: border-box;
  &:last-child {
    border-right: none;
  }
}
.demo-color-picker .demonstration {
  display: block;
  color: var(--el-text-color-secondary);
  font-size: 14px;
  margin-bottom: 20px;
}
.demo-color-picker .#{$namespace}-color-picker + .#{$namespace}-color-picker {
  margin-left: 20px;
}