Curve css background
Web2tailwind.com

Output

Code

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <link href="https://unpkg.com/[email protected]^1.0/dist/tailwind.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/gh/alpinejs/[email protected]/dist/alpine.min.js" defer></script>
    <link href="https://fonts.googleapis.com/css?family=Source+Code+Pro|Roboto&display=swap" rel="stylesheet">
</head>
<style>
 .bg-border-radius {
  margin: -40vw auto 0;
  width: 100%;
  height: 70vw;
  overflow: hidden;
  border-radius: 0 0 70% 70%;
  background-color: #0080C1;
}
</style>
<body style="font-family:Roboto">
   <div class="bg-border-radius"></div>
</body>

</html>
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