* {
	margin: 0px;
	padding: 0px;
}

html, body {
	height: 100%;
	background-color: white;
}

#contain {
	padding-bottom: 6rem;
}

#navigation {
	height: 5rem;
	background-color: #191970;
	display: flex;
	flex-direction: row;
	justify-content: space-around;
	flex: 1 1 auto;
	align-items: center;
}

#navleft {
	flex-basis: 70%;
	display: flex;
	flex-direction: row;
	align-items: center;
}

#navleft img {
	height: 3rem;
	padding: 5px;
	border-radius: 12px;
}

#navleft span {
	font-size: 1.2rem;
	font-weight: 600;
	color: white;
}

#navright {
	flex-basis: 30%;
	display: flex;
	flex-direction: row;
	align-items: center;
	justify-content: space-around;
	color: white;
}

#courseimg {
	width: 100%;
	background-color: white;
}

#courseimg img {
	width: 100%;
}

#kctx {
	width: 100%;
	text-align: center;
}

#kctx img {
	width: 100%;
}


/*底部tab*/
#button {
	position: fixed;
	bottom: 0;
	height: 4rem;
	width: 100%;
	display: flex;
	flex-direction: row;
	justify-content: space-around;
	align-items: center;
	background-color: white;
}

#button img {
	width: 1.8rem;
}

.button-item {
	display: flex;
	flex-direction: column;
	align-items: center;
	font-size: 0.7rem;
}