#progress-bar{height:8px;left:0;max-width:100vw;opacity:0;position:fixed;top:0;transition:opacity .4s;z-index:100}@media only screen and (max-width:767px){#progress-bar{height:4px}}@media only screen and (min-width:768px){#progress-bar{transition:width .1s,opacity .4s}}