body {
    /* 加载背景图 */
    background-image: url("./img/930dbb2965164cdb98c03cfe2853b1e1.jpg");
    /* 背景图垂直,水平均居中 */
    background-position: center center;
    /* 背景图不平铺 */
    background-repeat: no-repeat;
    /* 当内容高度大于图片高度时,背景图像的位置相对于viewport固定 */
    background-attachment: fixed;
    /* 让背景图基于容器大小伸缩 */
    background-size: cover;
    /* 设置背景颜色,背景图加载过程中会显示背景色 */
    background-color: #464646;
}
 
form{
	text-align: center;
	position: absolute;   /*表单于页面居中*/
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
}
 
input[type=text],input[type=password]{
	background-color: white;  /*正常状态样式*/
	color: black;
	border:none;
	border-radius: 20px;
	outline: none;
	text-align: center;
	height: 50px;
	width: 250px;
	margin: 5px;
}
 
input[type=button]{
	background-color: #45A0F2;  /*正常状态样式*/
	color: white;
	border:none;
	border-radius: 20px;
	outline: none;
	text-align: center;
	height: 50px;
	width: 250px;
	margin: 5px;
}
 
input[type=text]:hover,input[type=password]:hover{
	outline: none;  /*悬停时样式*/
	background-color: #65BCD6;
	color: white;
	box-shadow: 0 8px 16px 0 rgba(0,0,0,0.45), 0 6px 20px 0 rgba(0,0,0,0.19);  /*阴影*/
}
 
input[type=button]:hover{
	outline: none;  /*悬停时样式*/
	background-color:#168DBE;
	color: white;
	box-shadow: 0 8px 16px 0 rgba(0,0,0,0.45), 0 6px 20px 0 rgba(0,0,0,0.19);  /*阴影*/
}