/* Large screen non-retina => Do nothing */
@media only screen and (min-width: 480px) {
     /*  font-size: 2px*/
}

/* Large screen, retina, stuff to override above media query */
@media
only screen and (-webkit-min-device-pixel-ratio: 2)      and (min-width: 480px),
only screen and (   min--moz-device-pixel-ratio: 2)      and (min-width: 480px),
only screen and (     -o-min-device-pixel-ratio: 2/1)    and (min-width: 480px),
only screen and (        min-device-pixel-ratio: 2)      and (min-width: 480px),
only screen and (                min-resolution: 192dpi) and (min-width: 480px),
only screen and (                min-resolution: 2dppx)  and (min-width: 480px),
only screen and (-webkit-device-pixel-ratio: 2)          and (min-width: 480px){
    .replace-2x {
       font-size: 1px
    }
}

/* Small screen, non-retina */
@media only screen and (max-device-width: 480px){
    .replace-2x {
       font-size: 2px
    }
}

/* Small screen, retina, stuff to override above media query*/
@media
only screen and (-webkit-min-device-pixel-ratio: 2)      and (max-device-width: 480px),
only screen and (   min--moz-device-pixel-ratio: 2)      and (max-device-width: 480px),
only screen and (     -o-min-device-pixel-ratio: 2/1)    and (max-device-width: 480px),
only screen and (        min-device-pixel-ratio: 2)      and (max-device-width: 480px),
only screen and (                min-resolution: 192dpi) and (max-device-width: 480px),
only screen and (                min-resolution: 2dppx)  and (max-device-width: 480px),
only screen and (-webkit-device-pixel-ratio: 2)          and (max-device-width: 480px){
    .replace-2x {
       font-size: 3px
    }
}