CSS code to implement width-to-height proportional layout-CSS Tutorial-php.cn

CSS code to implement width-to-height proportional layout

小云云

Release： 2018-03-14 09:38:27

Original

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The width is twice the height (proportional scaling)Implementation idea: Based on the parent element, child width: 100%; (that is, 100% of the parent width), padding- top:50% (that is, 50% of the parent width. According to the CSS specification, if padding is expressed as a percentage, padding: 100% is equal to the width of the parent element);

Why not directly `width: 50%; height: 50%;?

Then the height will become 50% of the height of the parent (unless the width and height of the parent are equal);

Original title:

The red block-level element is vertically centered in the center of the screen;
The red block-level element is distanced from the left and right margins of the screen 20px each;
The content inside the red block-level element is centered horizontally and vertically;
The height of the red block-level element is always the same as that of the red block-level element 50% of width.

The ratio of width to height of the red part is 2:1

Source code:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>宽高比例固定</title>
    <style>

        .father{
            overflow: hidden;
            position: absolute;
            left: 10px;
            right: 10px;
            top: 50%;
            transform: translateY(-50%);
            background-color: #0c8ac5;
        }

        .son{
            width: 100%;
            padding-top: 50%;
            background-color: #c03035;

        }
        span{
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            font-size: 20px;
            color: #D8D8D8;
        }

        img{
            float: left;
            margin-right: 10px;
            border: 2px solid #fdf6e3;
        }

    </style>
</head>
<body>
    <section class="father">
        <p class="son"><span><img src="https://p2.ssl.cdn.btime.com/t0167d9ebac0d0e1828.jpg" alt="" width="200px"> 王也, 武当派弟子（现已离开武当），八奇技之一风后奇门的继承人，靠占卜悟出天道，却又作出甘于投身乱世的选择。外表一副老好人的温良相，谦谦有礼如温吞水般，做事也经常是一副没精打采，貌似没睡醒的样子。优哉游哉还脾气软，代表举动经常是歉意笑着作出让步。似乎对什么都无所谓，一副悠然道人之姿，但是在涉及到家人安危时毫不含糊，甚至为此做出过有失冷静的举动。不小心爆粗都会拜祖道歉的出家人，实力在后生一辈中甚至称得上头筹，暂时只有一次完全没预料到地阴沟里翻船。</span></p>
    </section>
</body>
</html>

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