.a{
	background-size:cover;
	background-image: url(../img/口罩背景2.jpg);
	height: 700px;
	width: 1300px;
	margin: 0;
}
.b{
	width: 950px;
	height: 46px;
	padding-top: 100px;
	padding-left: 100px;
	color: white;
	text-align: center;
}
h1{
	font-size: 3em;
}
.c{
	border: 1;
	height: 300px;
	width: 300px;
	border-radius: 15px;
	background-color: #1c4557;
	opacity:0.7;
	margin-left:100px;
	margin-top: 100px;
}
.c1{
	text-align: center;
	font-size: 2em;
	padding-top:20px ;
	color: white;
}
.c2{
	text-align: center;
	padding: 20px;
}
.c22{
	font-size: 20px;
	height: 20px;
	padding-left: 20px;
	border-radius: 5px;
}
.c3{
	color: white;
	font-size: 20px;
	text-align: center;
	padding-top: 10px;
	padding-bottom: 10px;
}
.c4{
	border:0px;
    width: 150px;
    height:30px;
    background-color: #127adc;
    font-size:20px;
    color:#ffffaa;
    border-radius: 5px;
}