* {
    margin: 0;
    padding: 0;
	font-family: "宋体";
	font-size: 35px;
}

@keyframes fadeIn {
	from {opacity: 0;}
	to {opacity: 1;}
}

body {
	animation-name: fadeIn;
	animation-duration: 1s;
	animation-iteration-count: 1;
}

#introduction {
	background-color: #000000;
	width:100%;
	height:400px;
	color: #ffffff;
}

#content {
	position: absolute;
	top: 16%;
	left: 16%;
	width: 68%;
	text-align: center;
}

#main {
	display: flex;
	text-align: center;
}

#main img {
	border: 1px solid #000000;
	border-radius: 20px;
	height: 200px;
	width: 200px;
}

.card {
	width: 17%;
	margin: 4%;
}

.card > ul{
	text-align: left;
}