
.o_colorpicker_widget .o_opacity_slider, .o_colorpicker_widget .o_color_preview {
  position: relative;
  z-index: 0;
}

.o_colorpicker_widget .o_opacity_slider::before, .o_colorpicker_widget .o_color_preview::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  z-index: -1;
  background-image: url("/web/static/src/img/transparent.png");
  background-size: 10px auto;
  border-radius: inherit;
}

.o_colorpicker_widget .o_opacity_slider::after, .o_colorpicker_widget .o_color_preview::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  z-index: -1;
  background: inherit;
  border-radius: inherit;
}

