injectStyle(`@keyframes wobble {
    0% { transform: translate(0, -10px) }
    25% { transform: translate(10px, 0) }
    50% { transform: translate(0, 10px) }
    75% { transform: translate(-10px, 0) }
}`);

iterateResursive(document.body.children, applyStyle);

function injectStyle(style) {
    var el = document.createElement('style');
    el.innerHTML = style;
    document.body.appendChild(el);
}

function iterateResursive(els, cb) {
    for(var i = 0; i < els.length; i++) {
        iterateResursive(els[i].children, cb);
        cb(els[i]);
    }
}

function applyStyle(el) {
    var delay = Math.random() * 2;

    el.style.animation = [
        'wobble',
        '2s',
        'linear',
        delay + 's',
        'infinite'
    ].join(' ');
}