button .html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body{
            font-family: Arial, sans-serif;
            background-color: #000000;
            margin: 0;
            padding: 0;
            color: #ffffff;
            justify-content: center;
            text-align: center;
        }
        h1{
            font-size: 10em;
            -webkit-box-reflect: below 1px linear-gradient(transparent, rgba(0, 0, 0, 0.333));
            margin-bottom: 25vh;
        }
        button{
            width: 5em;
            font-size: 3em;
            padding: 15px 20px;
            border-radius: 15px;
            margin: 25px;
        }
        button:hover{
            background-color: #868686;
            -webkit-box-reflect: below 1px linear-gradient(transparent, rgba(0, 0, 0, 0.333));
        }
    </style>
</head>
<body>
    <H1 id="h1">Monday</H1>
    <button class="btn" onclick="show()">Show</button>
    <button class="btn" onclick="hide()">Hide</button>
    <script>
        function hide(){
        document.getElementById("h1").style.display = "none";}
        function show(){
            document.getElementById("h1").style.display = "block";}
        </script>
</body>
</html>