CSS and CSS3 flexible box model to achieve element width (height) adaptation

1. CSS realizes fixed width on the left and adaptive width on the right

1. Positioning

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Adaptive</title>
    <style>
        *{
            padding: 0;
            margin: 0;
        }
        .left{
            background: red;
            width: 200px;
            height: 200px;
            position: absolute;/*positioning*/
            left: 0;
            top:0;
        }
        .right{
            background: blue;
            height: 200px;
            margin-left: 210px;
        }
    </style>
</head>
<body>
    <div class="left">
        Fixed width</div>
    <div class="right">
        Adaptive
</body>
</html>

2. Floating

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Adaptive</title>
    <style>
        *{
            padding: 0;
            margin: 0;
        }
        .left{
            background: red;
            width: 200px;
            height: 200px;
            float: left;/*float*/
        }
        .right{
            background: blue;
            height: 200px;
            margin-left: 210px;
        }
    </style>
</head>
<body>
    <div class="left">
        Fixed width</div>
    <div class="right">
        Adaptive
</body>
</html>

3. Margin

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Adaptive</title>
    <style>
        *{
            padding: 0;
            margin: 0;
        }
        .left{
            background: red;
            width: 200px;
            height: 200px;
        }
        .right{
            background: blue;
            height: 200px;
            margin-top: -200px;/*margin*/
            margin-left: 210px;
        }
    </style>
</head>
<body>
    <div class="left">
        Fixed width</div>
    <div class="right">
        Adaptive
</body>
</html>

2. CSS3 elastic box model realizes adaptation

1. Fixed upper and lower heights, adaptive middle height

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        body,html{
            height: 100%;
        }
        #contain{
            display: flex;
            flex-direction: column;/*column vertical direction*/
            height: 100%;/*Full screen effect: this element and its parent element and html, body height: 100%*/
        }
        #top{
           height: 200px;
            background: red;
        }
        #center {
            flex: 1;
            background: blue;
        }
        #bottom{
            height: 100px;
            background: green;
        }
    </style>
 
</head>
<body>
<div id="contain">
    <div id="top">Hello</div>
    <div id="center">Hello</div>
    <div id="bottom">Hello too</div>
</div>
</body>
</html>

2. The left width is fixed and the right width is adaptive

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
 
        #contain {
            display: flex; /*The parent element sets this attribute*/
        }
 
        #left {
            width: 100px;
            height: 200px;
            background: #fff8a8;
            margin-right: 10px;
        }
 
        #right {
            flex: 1; /*Proportion/number of copies*/
            height: 200px;
            background: #ff9bad;
        }
    </style>
</head>
<body>
<div id="contain">
    <div id="left"></div>
    <div id="right"></div>
</div>
</body>
</html>

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