body {
    background-color: #F5F5F5;
    color: #555;
    font-size: 1.1em;
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

.container {
    margin: 100px auto;
    max-width: 700px;
}

.element {
    width: 50px;
    height: 50px;
    background-color: #009966;
    position: relative;
    margin: 0 auto;
    -webkit-animation-name: bounce;
    animation-name: bounce;
    -webkit-animation-duration: 2s, 2s;
    animation-duration: 2s, 2s;
    -webkit-animation-iteration-count: infinite, infinite;
    animation-iteration-count: infinite, infinite;
}

@-webkit-keyframes shake-rotate {
    0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100% {
        left: 50px;
        -webkit-transform: rotate(45deg);
        transform: rotate(45deg);
    }
    5%, 15%, 25%, 35%, 45%, 55%, 65%, 75%, 85%, 95% {
        left: -50px;
        -webkit-transform: rotate(-45deg);
        transform: rotate(-45deg);
    }
}

@keyframes shake-rotate {
    0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100% {
        left: 50px;
        -webkit-transform: rotate(45deg);
        transform: rotate(45deg);
    }
    5%, 15%, 25%, 35%, 45%, 55%, 65%, 75%, 85%, 95% {
        left: -50px;
        -webkit-transform: rotate(-45deg);
        transform: rotate(-45deg);
    }
}

@-webkit-keyframes bounce {
    from {
        top: 150px;
        -webkit-animation-timing-function: ease-out;
        animation-timing-function: ease-out;
    }
    25% {
        top: 50px;
        -webkit-animation-timing-function: ease-in;
        animation-timing-function: ease-in;
    }
    50% {
        top: 200px;
        -webkit-animation-timing-function: ease-out;
        animation-timing-function: ease-out;
    }
    75% {
        top: 75px;
        -webkit-animation-timing-function: ease-in;
        animation-timing-function: ease-in;
    }
    to {
        top: 150px;
    }
}

@keyframes bounce {
    from {
        top: 150px;
        -webkit-animation-timing-function: ease-out;
        animation-timing-function: ease-out;
    }
    25% {
        top: 50px;
        -webkit-animation-timing-function: ease-in;
        animation-timing-function: ease-in;
    }
    50% {
        top: 200px;
        -webkit-animation-timing-function: ease-out;
        animation-timing-function: ease-out;
    }
    75% {
        top: 75px;
        -webkit-animation-timing-function: ease-in;
        animation-timing-function: ease-in;
    }
    to {
        top: 150px;
    }
}