Targeting retina display with media query

Working at a mobile project (that includes jQuery mobile), I’ve encountered the following problem: I wanted to rewrite the default image for the checkboxes, that jQuery mobile provides. Just adding the new background like bellow wasn’t enough.

.ui-icon-checkbox-on {
  background: url(/images/mobile/checkbox-off.png) no-repeat;
  -webkit-background-size: 56px 58px;
  -moz-background-size: 56px 58px;
  background-size: 56px 58px;
  width: 56px;
  height: 58px;
.ui-icon-checkbox-on {
  background: url(/images/mobile/checkbox-on.png) no-repeat;

The code above works only on normal devices, but on retina displays the css from jQuery mobile wasn’t rewritten. For that, I’ve created an image twice as big as the previous one, and used the following code:

@media only screen and (-webkit-min-device-pixel-ratio: 2),
       only screen and (min--moz-device-pixel-ratio: 2),
       only screen and (-o-min-device-pixel-ratio: 2/1),
       only screen and (min-device-pixel-ratio: 2) {
         .ui-icon-checkbox-off {
           background: url(/images/mobile/checkbox-off2x.png) no-repeat;
         .ui-icon-checkbox-on {
           background: url(/images/mobile/checkbox-on2x.png) no-repeat;

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