JSFiddle - React, Tailwind, and code Playground

HTML

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

<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">
    <title>Meses 2</title>
    <link rel="stylesheet" href="css/styles.css">
</head>

<body class="body">
    <script src="js/app.js"></script>
</body>

</html>

CSS

:root {
    --transparencia: 0.6;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background-size: cover;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-position: center;
}

JavaScript

const meses = [
    'linear-gradient(hsla(0, 68%, 42%, var(--transparencia)), hsla(0, 68%, 42%, var(--transparencia))), url(https://cdn.pixabay.com/photo/2020/01/07/20/12/bike-4748495_960_720.jpg)',
    'linear-gradient(hsla(304, 53%, 56%, var(--transparencia)), hsla(304, 53%, 56%, var(--transparencia))), url(https://cdn.pixabay.com/photo/2018/04/23/23/59/swan-3346004_960_720.jpg)',
    'linear-gradient(hsla(182, 56%, 39%, var(--transparencia)), hsla(182, 56%, 39%, var(--transparencia))), url(https://cdn.pixabay.com/photo/2019/11/01/17/10/rose-4594713_960_720.jpg)',
    'linear-gradient(hsla(0, 0%, 100%, var(--transparencia)), hsla(0, 0%, 100%, var(--transparencia))), url(https://cdn.pixabay.com/photo/2016/02/18/20/02/flower-1207954_960_720.jpg)',
    'linear-gradient(hsla(143, 95%, 40%, var(--transparencia)), hsla(143, 95%, 40%, var(--transparencia))), url(https://cdn.pixabay.com/photo/2017/07/25/14/57/rain-2538443_960_720.jpg)',
    'linear-gradient(hsla(39, 100%, 50%, var(--transparencia)), hsla(39, 100%, 50%, var(--transparencia))), url(https://cdn.pixabay.com/photo/2020/12/29/23/35/sea-5871912_960_720.jpg)',
    'linear-gradient(hsla(337, 86%, 47%, var(--transparencia)), hsla(337, 86%, 47%, var(--transparencia))), url(https://cdn.pixabay.com/photo/2020/01/25/11/45/new-year-4792346_960_720.jpg)',
    'linear-gradient(hsla(54, 79%, 44%, var(--transparencia)), hsla(54, 79%, 44%, var(--transparencia))), url(https://cdn.pixabay.com/photo/2016/08/07/08/20/beach-1575816_960_720.jpg)',
    'linear-gradient(hsla(227, 34%, 55%, var(--transparencia)), hsla(227, 34%, 55%, var(--transparencia))), url(https://cdn.pixabay.com/photo/2017/10/02/21/55/chestnut-2810482_960_720.jpg)',
    'linear-gradient(hsla(300, 100%, 50%, var(--transparencia)), hsla(300, 100%, 50%, var(--transparencia))), url(https://cdn.pixabay.com/photo/2020/01/07/18/16/away-4748291_960_720.jpg)',
    'linear-gradient(hsla(51, 100%, 50%, var(--transparencia)), hsla(51, 100%, 50%, var(--transparencia))),...