@-moz-keyframes tada{ 
    0%{-moz-transform:scale(1);} 
    10%,20%{-moz-transform:scale(0.9) rotate(-3deg);} 
    30%,50%,70%,90%{-moz-transform:scale(1.2) rotate(3deg);} 
    40%,60%,80%{-moz-transform:scale(1.2) rotate(-3deg);} 
    100%{-moz-transform:scale(1) rotate(0);} 
   } 

  @-webkit-keyframes tada{ 
    0%{-webkit-transform:scale(1);} 
    10%,20%{-webkit-transform:scale(0.9) rotate(-3deg);} 
    30%,50%,70%,90%{-webkit-transform:scale(1.2) rotate(3deg);} 
    40%,60%,80%{-webkit-transform:scale(1.2) rotate(-3deg);} 
    100%{-webkit-transform:scale(1) rotate(0);}} 

.doudun:hover{ 
  -webkit-animation: tada 1s .2s ease both; 
  -moz-animation: tada 1s .2s ease both; 
}