'How to blend the div in css?

I have blended the rectangle using figma but I am searching for how to do it in css so it can view like below image (the blue one),

enter image description here

How to achive this is css ?

<!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">
    <style>
        body {
            width: 100vw;
            height: 100vh;
            margin: 0%;
            padding: 0%;
        }
        .outer {
            width: 100vw;
            height: 100vh;
            background-color: white;
        }

        .outer .inner {
            /*How to do blend it*/
            width: 100vw;
            height: 100vh;
            background-color: #12B1F2;
        }
    </style>
    <title>Demo</title>
</head>
<body>
    <div class="outer">
        <div class="inner">

        </div>
    </div>
</body>
</html>
htmlcss


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