背景圖片加表單居中

body {
	width: 100%;
	height: 100vh;
	background: url('./img/bg.jpg') no-repeat;
	background-size: cover;
	background-position: center center;
	background-attachment: fixed;
	display: flex;
}

.layui-form {
	margin: auto;
	width: 360px;
	background-color: rgba(255, 255, 255, 0.8);
	padding: 40px;
}