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="/static/imghwm/default1.png" data-src="https://p2.ssl.cdn.btime.com/t0167d9ebac0d0e1828.jpg" class="lazy" alt="" style="max-width:90%"> 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>
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