dojo_app/js/library/dojox/mobile/themes/android/CheckBox.css

/* dojox.mobile.CheckBox */
.mblCheckBox {
  position: relative;
  margin: -0.5em 3px 0.3em 4px;
  width: 1em;
  height: 1em;
  border-style: outset;
  border-width: 1px;
  background-image: -webkit-gradient(linear, left top, left bottom, from(#fdfdfd), to(#cecece), color-stop(0.5, #f8f8f8), color-stop(0.5, #eeeeee));
  background-image: linear-gradient(to bottom, #fdfdfd 0%, #f8f8f8 50%, #eeeeee 50%, #cecece 100%);
  font: inherit;
  cursor: pointer;
  -webkit-appearance: none;
  -webkit-tap-highlight-color: rgba(255, 255, 255, 0);
  -webkit-transform: translateY(0.45em);
  transform: translateY(0.45em);
  border-color: #9cacc0;
  border-radius: 3px;
}
.mblCheckBoxSelected {
  background-image: -webkit-gradient(linear, left top, left bottom, from(#306ea1), to(#266093), color-stop(0.06, #4090d3), color-stop(0.5, #306ea1));
  background-image: linear-gradient(to bottom, #306ea1 0%, #4090d3 6%, #306ea1 50%, #266093 100%);
}
.mblCheckBoxChecked,
.mblCheckBox:checked {
  background-image: -webkit-gradient(linear, left top, left bottom, from(#00a200), to(#00d300), color-stop(0.2, #00ba00), color-stop(0.2, #00ba00));
  background-image: linear-gradient(to bottom, #00a200 0%, #00ba00 20%, #00ba00 20%, #00d300 100%);
}
.mblCheckBoxChecked::after,
.mblCheckBox:checked::after {
  position: absolute;
  content: "";
  width: 0.3em;
  height: 0.6em;
  top: 0;
  left: 0.3em;
  border-width: 0.15em;
  border-style: none solid solid none;
  -webkit-transform: rotate(45deg);
  transform: rotate(45deg);
  -webkit-transform-origin: 50% 50%;
  transform-origin: 50% 50%;
  border-color: white;
}
.mblCheckBoxChecked.mblCheckBoxSelected,
.mblCheckBox:checked.mblCheckBoxSelected {
  background-image: -webkit-gradient(linear, left top, left bottom, from(#306ea1), to(#266093), color-stop(0.06, #4090d3), color-stop(0.5, #306ea1));
  background-image: linear-gradient(to bottom, #306ea1 0%, #4090d3 6%, #306ea1 50%, #266093 100%);
}