machinecat520
/
zj-Exercise


			
				
					
						
						
							1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465
							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>固定定位</title>
    <style>

        /* 
            固定定位
                -将元素的position属性设置为fixed则开启了元素的固定定位
                -固定定位也是一种绝对定位，所以固定定位的大部分特点都和绝对定位一样
                    唯一不同的是，固定定位永远参照于浏览器的视口进行定位
                    固定定位的元素不会随网页的滚动条滚动
            
        */

        body{
            font-size: 50px;
        }
        .box1{
            width: 200px;
            height: 200px;
            background-color: #bfa;
        }

        .box2{
            width: 200px;
            height: 200px;
            background-color:orange;
        }

        .box3{
            width: 200px;
            height: 200px;
            background-color: yellow;
        }

        .box4{
            width: 400px;
            height: 400px;
            background-color: tomato;
        }
        .box5{
            width: 300px;
            height: 300px;
            background-color: aliceblue;
        }

    </style>
</head>
<body>
    <div class="box1">1</div>
    <div class="box4">
        4
        <div class="box5">
            5
            <div class="box2">2</div>
        </div>
    </div>    
    <div class="box3">3</div>

</body>
</html>