*{
	margin: 0;
	padding:0;
}
ul li{
	list-style: none;
}
a {
	text-decoration: none;
	-webkit-tap-highlight-color: rgba(255, 255, 255, 0);
	-webkit-user-select: none;
	-moz-user-focus: none;
	-moz-user-select: none;
}
@media screen and (min-width: 600px) {
		.all{
		width: 600px;
		margin: 0 auto;
		height: auto;
	}
}
header{
	height: 40px;
	background: #2196F3;
	color: #fff;
    position: relative;
}
.back{
    margin-left: 12px;
    position: absolute;
    top: 50%;
    left: 0;
    transform: translate(0, -50%);
}
.back a{
	color: #fff;
	text-decoration: none;
	font-size: 14px;
}
header span{
	display: block;
	text-align: center;
	line-height: 40px;
	width: 100%;
	/* font-weight: bold; */
}
.shan_chu{
	height: 40px;
	text-align: center;
	line-height: 40px;
	font-weight: bold;
	color: #52a855;
	border-top: 2px solid #e7e7e7;
	border-bottom: 2px solid #e7e7e7;
}
button{
	width: 80%;
	margin-left: 10%;
	margin-top: 20px;
	height: 35px;
	font-size: 17px;
	border-radius: 5px;
	background: #fff;
}
.tui_chu{
	background: #ca5353;
	color: #fff;
}