index.css

:root {
    --color-1: #541;
    --color-1a: rgba(85, 68, 17, 0);
    --color-1a: #5410;
    --color-2: #eb4;
    --color-3: #fe9;
}

html {
    font-family: 'Avenir', sans-serif;
    background: black;
}

a, label {
    color: var(--color-1)
}

#map {
	position: absolute;
	top: 0;
	left: 0;
    overflow: scroll;
    -webkit-overflow-scrolling: touch; /* ios */

}

#map iframe {
    position: absolute;
    width: 100%;
    height: 100%;
    border: none;
}

#legend {
    position: absolute;
    right: 0;
    bottom: 0;
    background: gray;
    background: var(--color-2);
    color: white;
    color: var(--color-3);
    overflow: scroll;
    -webkit-overflow-scrolling: touch; /* ios */
}
#legend.noclass:before {
    content: 'No results.';
    position: absolute;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.75);
    text-align: center;
    display: block;
    z-index: 4;
}

.disabled {
    opacity: 0.5;
    pointer-events: none;
}

@media all and (orientation: landscape) {
	#map {
		bottom: 0;
		right: 55%;
	}
    #legend {
        left: 45%;
        top: 0;
    }
}

@media all and (orientation: portrait) {
	#map {
		bottom: 55%;
		right: 0;
	}
    #legend {
        left: 0;
        top: 45%;
    }
}

form {
    display: inline;
}

ul {
    display: flex;
    list-style-type: none;
    padding: 0;
    margin: 0;
}

li {
    flex: 1;
    background: var(--color-1);
    text-align: center;
    opacity: 0.5;
    padding: 6px;
    margin: 1px;
    cursor: pointer;
}
li:hover, li.selected {
    opacity: 1;
}

.scroller {
    overflow: scroll;
    -webkit-overflow-scrolling: touch; /* ios */
}

.timeheader {
    position: -webkit-sticky; /* safari */
    position: sticky;
    left: 0;
    height: 24px;
    width: 100%;
    background: linear-gradient(to right,
        black 0%,
        transparent 10%, transparent 40%,
        black 50%,
        transparent 60%, transparent 90%,
        black 100%
    );
    background: linear-gradient(to right,
        var(--color-1) 0%,
        var(--color-1a) 10%, var(--color-1a) 40%,
        var(--color-1) 50%,
        var(--color-1a) 60%, var(--color-1a) 90%,
        var(--color-1) 100%
    );
    font-size: 18px;
    text-align: center;
    margin-bottom: -24px;
    z-index: 3;
}
.timeheader:after {
    content: attr(id);
    text-transform: uppercase;
}

.hidden, .hidden + .timetable {
    display: none;
}

.timetable {
    min-width: 1500px;
    margin-left: 55px;
}

.timeline {
    position: relative; /* .timespan position */
    font-variant: small-caps;
    margin-bottom: 1px;
    display: flex;
}
.timeline:first-child {
    height: 24px;
    background: black;
    background: var(--color-1);
    z-index: 2;
}
.timeline:before {
    content: attr(data-room);
    position: -webkit-sticky; /* safari */
    position: sticky;
    left: 0;
    width: 55px;
    background: black;
    background: var(--color-1);
    font-size: 14px;
    text-align: center;
    text-transform: uppercase;
    margin-left: -55px;
    z-index: 3;
}
.timeline:first-child:before {
    content: '';
    position: relative;
}

.timeunit {
    flex: 1;
    height: 4px;
    border: solid black;
    border: solid var(--color-1);
    border-width: 2px 1px 0 1px;
    z-index: 2;
    pointer-events: none;
}
.timeline:first-child .timeunit {
    height: auto;
    color: gray;
    color: var(--color-2);
    font-size: 12px;
    border: none;
    line-height: 24px;
}
.timeline:first-child .timeunit:after {
    vertical-align: text-top;
}
.timeline:first-child .timeunit:nth-child(1):after {content: '12am';}
.timeline:first-child .timeunit:nth-child(2):after {content: '1am';}
.timeline:first-child .timeunit:nth-child(3):after {content: '2am';}
.timeline:first-child .timeunit:nth-child(4):after {content: '3am';}
.timeline:first-child .timeunit:nth-child(5):after {content: '4am';}
.timeline:first-child .timeunit:nth-child(6):after {content: '5am';}
.timeline:first-child .timeunit:nth-child(7):after {content: '6am';}
.timeline:first-child .timeunit:nth-child(8):after {content: '7am';}
.timeline:first-child .timeunit:nth-child(9):after {content: '8am';}
.timeline:first-child .timeunit:nth-child(10):after {content: '9am';}
.timeline:first-child .timeunit:nth-child(11):after {content: '10am';}
.timeline:first-child .timeunit:nth-child(12):after {content: '11am';}
.timeline:first-child .timeunit:nth-child(13):after {content: '12pm';}
.timeline:first-child .timeunit:nth-child(14):after {content: '1pm';}
.timeline:first-child .timeunit:nth-child(15):after {content: '2pm';}
.timeline:first-child .timeunit:nth-child(16):after {content: '3pm';}
.timeline:first-child .timeunit:nth-child(17):after {content: '4pm';}
.timeline:first-child .timeunit:nth-child(18):after {content: '5pm';}
.timeline:first-child .timeunit:nth-child(19):after {content: '6pm';}
.timeline:first-child .timeunit:nth-child(20):after {content: '7pm';}
.timeline:first-child .timeunit:nth-child(21):after {content: '8pm';}
.timeline:first-child .timeunit:nth-child(22):after {content: '9pm';}
.timeline:first-child .timeunit:nth-child(23):after {content: '10pm';}
.timeline:first-child .timeunit:nth-child(24):after {content: '11pm';}

.timespan {
    position: absolute;
    top: 0;
    height: 90%;
    background: black;
    background: var(--color-1);
    border-radius: 0 0 6px 6px;
}
.timespan a {
    width: 100%;
    height: 100%;
    display: block;
}