html - Relative Spritesheet Animation in CSS -

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i'm trying find best way animate sprite sheet in webpage using css; found example @ http://jsfiddle.net/simurai/cgmce/, rendering frame in absolute pixels of 50x72. need sizing relative can downscale animated sprite smaller sizes @ smaller screen resolutions; have tried swapping out absolute pixel values relative sizes, , changing background-position property in keyframe animation relative value, not seem work (the animation becomes wonky, seemingly moving 1 frame another, instead of playing should). help/advice appreciated.

   .myanimationproperties {         width: 25%;         height: 25%;         background-image: url("images/myspritesheet.png");          -webkit-animation: play .8s steps(6) infinite;         -moz-animation: play .8s steps(6) infinite;         -ms-animation: play .8s steps(6) infinite;         -o-animation: play .8s steps(6) infinite;         animation: play .8s steps(6) infinite;     }      @-webkit-keyframes play {        { background-position:    0%; }          { background-position: -100%; }     }      @-moz-keyframes play {        { background-position:    0%; }          { background-position: -100%; }     }      @-ms-keyframes play {        { background-position:    0%; }          { background-position: -100%; }     }      @-o-keyframes play {        { background-position:    0%; }          { background-position: -100%; }     }      @keyframes play {        { background-position:    0%; }          { background-position: -100%; }     }

what if change background-size smaller screens?


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