【CSS】这种凹角用css3如何实现

图片描述

回答：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .outer{
            position: absolute;
            left: 100px;
            top: 100px;
            width: 300px;
            height: 500px;
            background-color: #0a6ebd;
            display: flex;
            justify-content: center;
            align-items: center;
            box-sizing: border-box;
            border: 1px solid #0a6ebd;
        }
        .inner-1{
            width: 250px;
            height: 450px;
            box-sizing: border-box;
            background-color: #0da6ec;
            position: relative;
            display: flex;
            justify-content: center;
            align-items: center;
            border: 1px solid red;
            border-top-left-radius: 25px;
        }
        .inner-2{
            width: 200px;
            height: 400px;
            box-sizing: border-box;
            background-color: #00bcd4;
            position: relative;
            border: 1px solid red;
            border-top-left-radius: 25px;
        }
        .left-corner{
            width: 25px;
            height: 25px;
            /* border-radius: 100%; */
            border-bottom-right-radius: 100%;
            background-color: inherit;
            position: absolute;
            left: -1px;
            top: -1px;
            z-index: 10;
            border-bottom: 1px solid red;
            border-right: 1px solid red;
            box-sizing: border-box;
        }
    </style>
</head>
<body>
    <div class="outer">
        <div class="inner-1">
            <div class="left-corner" style="    background-color: #0a6ebd;"></div>
            <div class="inner-2">
                <div class="left-corner" style="background-color: #0da6ec;"></div>
            </div>
        </div>
    </div>
</body>
</html>

回答：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
    <title>css</title>
</head>
<body>
<style>
#a {
    width: 150px;
    height: 300px;
    background: radial-gradient(circle at top left,
    transparent 15px, #e6e4b7 0) top left,
    radial-gradient(circle at top right,
            transparent 15px, #e6e4b7 0) top right,
    radial-gradient(circle at bottom right,
            transparent 15px, #e6e4b7 0) bottom right,
    radial-gradient(circle at bottom left,
            transparent 15px, #e6e4b7 0) bottom left;
    background-size: 50% 50%;
    background-repeat: no-repeat;
    padding: 20px 24px 22px 20px;
}
#b {
    display: block;
    background: radial-gradient(circle at top left,
    transparent 15px, red 0) top left,
    radial-gradient(circle at top right,
            transparent 15px, red 0) top right,
    radial-gradient(circle at bottom right,
            transparent 15px, red 0) bottom right,
    radial-gradient(circle at bottom left,
            transparent 15px, red 0) bottom left;
    background-size: 50% 50%;
    background-repeat: no-repeat;
    width:100%;
    height: 100%;
    padding: 2px;
}
#b:before {
    content: "";
    width: 100%;
    height: 100%;
    display: block;
    background: radial-gradient(circle at top left,
    transparent 15px, #e6e4b7 0) top left,
    radial-gradient(circle at top right,
            transparent 15px, #e6e4b7 0) top right,
    radial-gradient(circle at bottom right,
            transparent 15px, #e6e4b7 0) bottom right,
    radial-gradient(circle at bottom left,
            transparent 15px, #e6e4b7 0) bottom left;
    background-size: 50% 50%;
    background-repeat: no-repeat;
}
</style>
    <div id="a">
        <div id="b"></div>
    </div>
</body>
</html>

回答：

假设这个div id是a

        #a {
            width: 100px;
            height: 300px;
            background: radial-gradient(circle at top left,
            transparent 8px, #e6e4b7 0) top left,
            radial-gradient(circle at top right,
                    transparent 8px, #e6e4b7 0) top right,
            radial-gradient(circle at bottom right,
                    transparent 8px, #e6e4b7 0) bottom right,
            radial-gradient(circle at bottom left,
                    transparent 8px, #e6e4b7 0) bottom left;
            background-size: 50% 50%;
            background-repeat: no-repeat;
        }

具体参数自己调一下

回答：

border-radius?

回答：

如果大的背景是张图呢，凹角要看得到背景图

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