Simple way to create a 'bounce' effect with css's keyframes

gistfile1.css

.myBounceDiv { 
        -moz-animation:bounce .40s linear;  
        -webkit-animation:bounce .40s linear; 
} 

@-moz-keyframes bounce {
        0%{ -moz-transform:scale(0); opacity:0;}
        50%{ -moz-transform:scale(1.3); opacity:0.4; }
        75%{ -moz-transform:scale(0.9); opacity:0.7;}
        100%{ -moz-transform:scale(1); opacity:1;}
}

@-webkit-keyframes bounce {
        0%{ -webkit-transform:scale(0); opacity:0;}
        50%{ -webkit-transform:scale(1.3); opacity:0.4;}
        75%{ -webkit-transform:scale(0.9); opacity:0.7;}
        100%{ -webkit-transform:scale(1); opacity:1;}
}