html,body {
	width: 100%;
	height: 100%;
	margin: 0;
	padding: 0;
	display: flex;
	align-items: center;
	justify-content: center;
	overflow: hidden;
}

.cube span[class*="questionmark"] {
	position: absolute;
	display: flex;
	align-items: center;
	justify-content: center;
	font-size: 4em;
	perspective: 3000px;
	transform-style: preserve-3d;
	perspective-origin: 50% 50%;
	backface-visibility: visible;
	line-height: 1.5;
	width: var(--cube-size);
	height: var(--cube-size);
	text-align: center;
	animation: rollKey 8s linear infinite;
	transition: all 1s ease;
	color: #fff;
	text-shadow: 0 0 5px #000;
}

.cube {
	--cube-size: min(50vw, 50vh);
	width: var(--cube-size);
	height: var(--cube-size);
	perspective: 3000px;
	transform-style: preserve-3d;
	perspective-origin: 50% 50%;
	backface-visibility: visible;
	transition: transform 20s ease;
	position: relative;
	animation: roll 8s linear infinite;
}

.cube div {
	transition: all 1s ease;
}

.cube .front,.cone .front {
	display: block;
	position: absolute;
	width: var(--cube-size);
	height: var(--cube-size);
	border: none;
	line-height: var(--cube-size);
	font-family: arial, sans-serif;
	font-size: 60px;
	color: white;
	text-align: center;
	background: linear-gradient(45deg, rgba(190,53,21,0.65), rgba(43,47,147,0.65), rgba(46,211,31,0.65), rgba(104,44,108,0.65), rgba(37,213,193,0.65));
	transform: translateZ(calc(var(--cube-size) / 2));
	backface-visibility: visible;
}

.cube .back,.cone .back {
	display: block;
	position: absolute;
	width: var(--cube-size);
	height: var(--cube-size);
	border: none;
	line-height: var(--cube-size);
	font-family: arial, sans-serif;
	font-size: 60px;
	color: white;
	text-align: center;
	background: linear-gradient(45deg, rgba(190,53,21,0.65), rgba(46,211,31,0.65), rgba(104,44,108,0.65), rgba(43,47,147,0.65), rgba(37,213,193,0.65));
	color: black;
	transform: rotateY(180deg) translateZ(calc(var(--cube-size) / 2));
	backface-visibility: visible;
}

.cube .right,.cone .right {
	display: block;
	position: absolute;
	width: var(--cube-size);
	height: var(--cube-size);
	border: none;
	line-height: var(--cube-size);
	font-family: arial, sans-serif;
	font-size: 60px;
	color: white;
	text-align: center;
	background: linear-gradient(45deg, rgba(46,211,31,0.65), rgba(190,53,21,0.65), rgba(43,47,147,0.65), rgba(37,213,193,0.65), rgba(104,44,108,0.65));
	transform: rotateY(90deg) translateZ(calc(var(--cube-size) / 2));
	backface-visibility: visible;
}

.cube .left,.cone .left {
	display: block;
	position: absolute;
	width: var(--cube-size);
	height: var(--cube-size);
	border: none;
	line-height: var(--cube-size);
	font-family: arial, sans-serif;
	font-size: 60px;
	color: white;
	text-align: center;
	background: linear-gradient(45deg, rgba(37,213,193,0.65), rgba(46,211,31,0.65), rgba(37,213,193,0.65), rgba(104,44,108,0.65), rgba(190,53,21,0.65));
	transform: rotateY(-90deg) translateZ(calc(var(--cube-size) / 2));
	backface-visibility: visible;
}

.cube .top,.cone .top {
	display: block;
	position: absolute;
	width: var(--cube-size);
	height: var(--cube-size);
	border: none;
	line-height: var(--cube-size);
	font-family: arial, sans-serif;
	font-size: 60px;
	color: white;
	text-align: center;
	background: linear-gradient(45deg, rgba(190,53,21,0.65), rgba(104,44,108,0.65), rgba(37,213,193,0.65), rgba(43,47,147,0.65), rgba(46,211,31,0.65));
	transform: rotateX(90deg) translateZ(calc(var(--cube-size) / 2));
	backface-visibility: visible;
}

.cube .bottom,.cone .bottom {
	display: block;
	position: absolute;
	width: var(--cube-size);
	height: var(--cube-size);
	border: none;
	line-height: var(--cube-size);
	font-family: arial, sans-serif;
	font-size: 60px;
	color: white;
	text-align: center;
	background: linear-gradient(45deg, rgba(190,53,21,0.65), rgba(104,44,108,0.65), rgba(37,213,193,0.65), rgba(43,47,147,0.65), rgba(46,211,31,0.65));
	transform: rotateX(-90deg) translateZ(calc(var(--cube-size) / 2));
	backface-visibility: visible;
}

@keyframes roll {
	0% {
		transform: rotateY(0deg) rotateX(0deg);
	}
	100% {
		transform: rotateY(360deg) rotateX(360deg);
	}
}

@keyframes rollKey {
	0% {
		transform: rotateY(360deg) rotateX(360deg);
	}
	100% {
		transform: rotateY(0deg) rotateX(0deg);
	}
}