How can a block with position:fixed change color when passing a certain border?

P

pavel_samael2021-07-11 22:15:45

css

pavel_samael, 2021-07-11 22:15:45

It is necessary that when scrolling the page on a blue background it is white, and on a red one it is blue

Here is an example code

<!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">
    <link rel="stylesheet" href="css.css">
    <title>Document</title>
</head>
<body>
    <div class="fixed"></div>
    <div class="block red"></div>
    <div class="block blue"></div>
    <div class="block red"></div>
    <div class="block blue"></div>
</body>
</html>

.block {
        width: 100%;
        height: 200px;
    }

    .red {
        background: red;
    }

    .blue {
        background: blue;
    }

    .fixed {
        position: fixed;
        background: blue;
        top: 100px;
        left: 100px;
        z-index: 10;
        width: 80px;
        height: 80px;
    }

Reply

Answer the question

In order to leave comments, you need to log in

1 answer(s)

V

Vasily Zhukov, 2021-07-11
@vip_delete

make 2 fixed blocks in one place. one blue, the other red, in both mix-blend-mode: exclusion
https://jsfiddle.net/hc0v3qgy/