简单优美的登陆界面

界面效果图

1…HTML代码

    


    

            
航空选座系统登录
  

    

      
      用户名
    
    

		
		密码
    
     
	  
	
    

2.CSS样式代码

body{
    margin:0;
    padding: 0;
    font-family: sans-serif;
    background: url("login.jpg");
    background-size: cover;
}
.box
{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    width:400px;
 	padding: 40px;
    background:rgba(0,0,0,.8);
	box-sizing:border-box;
	box-shadow:0 15px 25px rgba(0,0,0,.5);
	border-radius: 10px;/*登录窗口边角圆滑*/
}
.box h2
{
	margin:0 0 30px;
	padding:0;
	color:#fff;
	text-align:center;
	}
	.box .inputBox
	{
		position:relative;
	}
.box .inputBox input
{
	width: 100%;
	padding: 10px 0;
	font-side:16px;
	color: #fff;
	letter-spacing: 1px;
	margin-bottom:30px;/*输入框设置*/
	border:none;
	border-bottom:1px solid #fff;
	outline:none;
	background:transparent;
}
.box .inputBox label
{
    position: absolute;
    top: 0;
    left: 0;
    padding: 10px 0;
    font-size: 16px;
    color: #fff;
    pointer-events: none;
    transition: .5s;
}
.box .inputBox input:focus ~ label,
.box .inputBox input:valid ~ label
{
    top: -18px;
	left: 0;
	color: #03a9f4;
	font-size: 12px;
}
.box  input[type="submit"] 
{
	background: transparent;
	border: none;
	outline: none;
	color: #fff;
	background: #03a9f4;
	padding: 10px 20px;
	cursor: pointer;
	border-radius: 5px;
}

背景图片：