.text {
    clear: both;
    margin: 3em 0;
}
.text span {
    width: 1.5em; height:1.5em; 
    background: red url(play.png); 
    display: inline-block;
    float: left;
    margin-right: .5em;
}
.text span.playing {
    background: pink url(^pause.png); 

}