animate.css/source/shake.css

@-webkit-keyframes shake {
	0%, 100% {-webkit-transform: translateX(0);}
	10%, 30%, 50%, 70%, 90% {-webkit-transform: translateX(-10px);}
	20%, 40%, 60%, 80% {-webkit-transform: translateX(10px);}
}

@-moz-keyframes shake {
	0%, 100% {-moz-transform: translateX(0);}
	10%, 30%, 50%, 70%, 90% {-moz-transform: translateX(-10px);}
	20%, 40%, 60%, 80% {-moz-transform: translateX(10px);}
}

@-o-keyframes shake {
	0%, 100% {-o-transform: translateX(0);}
	10%, 30%, 50%, 70%, 90% {-o-transform: translateX(-10px);}
	20%, 40%, 60%, 80% {-o-transform: translateX(10px);}
}

@keyframes shake {
	0%, 100% {transform: translateX(0);}
	10%, 30%, 50%, 70%, 90% {transform: translateX(-10px);}
	20%, 40%, 60%, 80% {transform: translateX(10px);}
}

.shake {
	-webkit-animation-name: shake;
	-moz-animation-name: shake;
	-o-animation-name: shake;
	animation-name: shake;
}