.bounce {
    font-size: 5em;
    line-height: 1em;
    margin: 10px 0 0 30px
}

@-moz-keyframes bounce {
    0%,
    20%,
    50%,
    80%,
    100% {
        -moz-transform: translateY(0);
        transform: translateY(0);
    }
    40% {
        -moz-transform: translateY(30px);
        transform: translateY(30px);
    }
    60% {
        -moz-transform: translateY(15px);
        transform: translateY(15px);
    }
}

@-webkit-keyframes bounce {
    0%,
    20%,
    50%,
    80%,
    100% {
        -webkit-transform: translateY(0);
        transform: translateY(0);
    }
    40% {
        -webkit-transform: translateY(30px);
        transform: translateY(30px);
    }
    60% {
        -webkit-transform: translateY(15px);
        transform: translateY(15px);
    }
}

@keyframes bounce {
    0%,
    20%,
    50%,
    80%,
    100% {
        -moz-transform: translateY(0);
        -ms-transform: translateY(0);
        -webkit-transform: translateY(0);
        transform: translateY(0);
    }
    40% {
        -moz-transform: translateY(30px);
        -ms-transform: translateY(30px);
        -webkit-transform: translateY(30px);
        transform: translateY(30px);
    }
    60% {
        -moz-transform: translateY(15px);
        -ms-transform: translateY(15px);
        -webkit-transform: translateY(15px);
        transform: translateY(15px);
    }
}

.bounce {
    -moz-animation: bounce 2s infinite;
    -webkit-animation: bounce 2s infinite;
    animation: bounce 2s infinite;
}