body {
	font-size: 16px;
	line-height : 1.6;
}

#control {
	position: fixed;
	bottom: 20px;
	right: 20px;
	display: flex;
	flex-direction: column;
	gap: 10px;　/* margin-top: 10pxと同じ働き*/
	z-index: 1000;
}

#control button {
	width: 50px;
	height: 50px;
	font-size: 24px;
	background-color: rgba(100, 150, 255, 0.3);
	border: 1px solid rgba(100, 150, 255, 0.6);
	color: #333;
	border-radius: 8px;
	cursor: pointer;
	transition: background-color 0.3s, opacity 0.3s;
	opacity: 0.7;
}

#control button: hover {
	background-color: rgba(100, 150, 255, 0.5);
	opacity: 1;
}