function fadeIn(quoteSpans) {
    Array.prototype.forEach.call(quoteSpans, function(word) {
        let animate = word.animate([{
                opacity: 0,
                filter: "blur(3px)"
            },{
                opacity: 1,
                filter: "blur(0px)"
            }],
            {
                duration: 1000,
                delay: delay,
                fill: 'forwards'
            }
        );
        delay= delay+300;
    })
}