* {
	margin: 0;
	box-sizing: border-box;
}

body {
	height: 100vh;
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
}

.hidden {
	display: none;
}

#notice {
	color: red;
	font-weight: bold;
	margin-bottom: 10px;
}