main.css

* {
	box-sizing: border-box;
}

.mdc-text-field {
	padding: 0;
}

body {
	color: rgba(0, 0, 0, 0.87);
	font-family: Roboto, Helvetica, Arial, sans-serif;
	margin: 0;
	padding: 0;
}

button {
	margin: 5px;
}

/* remote videos */

div#videos {
	display: flex;
	flex-direction: row;
	flex-wrap: wrap;
}

/*
div#videos {
	display: none;
} */

div#videos > video {
	background: black;
	width: 300px;
	height: 100%;
	display: block;
	transform: rotateY(180deg);
	-webkit-transform: rotateY(180deg);
	-moz-transform: rotateY(180deg);
}

/* one video */
#videos > video:first-child:nth-last-child(1) {
	width: 100%;
	height: 100vh;
}

/* two videos */
#videos > video:first-child:nth-last-child(2),
#videos > video:first-child:nth-last-child(2) ~ video {
	width: 50%;
	height: 100vh;
}

/* three videos */
#videos > video:first-child:nth-last-child(3),
#videos > video:first-child:nth-last-child(3) ~ video {
	width: 50%;
	height: 50vh;
}

/* four videos */
#videos > video:first-child:nth-last-child(4),
#videos > video:first-child:nth-last-child(4) ~ video {
	width: 50%;
	height: 50vh;
}

/* five videos */
#videos > video:first-child:nth-last-child(5),
#videos > video:first-child:nth-last-child(5) ~ video {
	width: 33.33%;
	height: 50vh;
}

/* six videos */
#videos > video:first-child:nth-last-child(6),
#videos > video:first-child:nth-last-child(6) ~ video {
	width: 33.33%;
	height: 50vh;
}

/* buttons wrapper before call */

.in-call #buttons {
	display: none;
}

#buttons {
	z-index: 3;
	width: 254px;
	position: absolute;
	border: 2px solid var(--mdc-theme-primary);
	padding: 20px;
	border-radius: 4px;
	left: 50%;
	top: 50%;
	transform: translate(-50%, -50%);
	background: white;
}

#buttons button {
	width: 200px;
}

/* hangup button */
#hangupBtn {
	display: none;
}

.in-call #hangupBtn {
	display: block;
	position: absolute;
	bottom: 50px;
	left: 50%;
	transform: translateX(-50%);
	z-index: 3;
}

/* current room text */
#currentRoom {
	position: absolute;
	bottom: 0;
	left: 0;
	color: red;
	z-index: 3;
}

/* mobile devices */

@media (max-width: 768px) {
	/* two videos */
	#videos > video:first-child:nth-last-child(2),
	#videos > video:first-child:nth-last-child(2) ~ video {
		width: 100%;
		height: 50vh;
	}
}