#duration{display:block;height:3600px}#content{margin:0 auto;overflow:hidden;position:sticky;width:100%}#intro{transition:opacity .3s ease-in-out}#transition{left:0;position:relative;transition:all .3s ease-in-out}#flex{display:flex;flex-direction:row;justify-content:center}video{max-width:900px;width:70%}#description{align-self:center;transition:opacity .3s ease-in-out;width:30%}#text-transition{left:0;position:relative;transition:all .3s ease-in-out}@media (max-width:991px){#flex{flex-direction:column}video{width:100%}#description{padding-top:40px;width:100%}}