tolong percantik dengan gaya kekinian button saya , gunakan bootstrap/apapun itu untuk mempercantik

ini adalah script code nya
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta property="og:locale" content="id_ID">
    <meta property="og:type" content="website">
    <meta property="og:title" content="Hipnoterapi Sidoarjo - Pendaftaran Layanan Hipnoterapi">
    <meta property="og:description" content="Layanan pendaftaran hipnoterapi Sidoarjo. Daftarkan diri Anda untuk mendapatkan terapi terbaik di Sidoarjo.">
    <meta property="og:url" content="https://hipnoterapisidoarjo.free.nf/layananhipnoterapi.php">
    <meta property="og:site_name" content="Hipnoterapi Sidoarjo">
    <meta property="og:image" content="https://hipnoterapisidoarjo.free.nf/logo.png">
    <meta property="og:image:width" content="500">
    <meta property="og:image:height" content="500">
    <title>Hipnoterapi Sidoarjo - Pendaftaran Layanan Hipnoterapi</title>
    <link rel="canonical" href="https://hipnoterapisidoarjo.free.nf/layananhipnoterapi.php">
    <link rel="icon" href="https://hipnoterapisidoarjo.free.nf/logo.ico">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
    <!-- Google Font -->
    <link href="https://fonts.googleapis.com/css2?family=Montserrat:wght@700&display=swap" rel="stylesheet">
    <style>
        body {
            background: linear-gradient(to right, #00c853, #00b0ff);
            color: #fff;
            font-family: Arial, sans-serif;
        }
        .container-custom {
            background: rgba(67, 206, 162, 0.8);
            border-radius: 10px;
            padding: 20px;
            margin-top: 20px;
        }
        .slider {
            position: relative;
            overflow: hidden;
            height: 300px;
        }
        .slider-wrapper {
            display: flex;
            width: 100%;
            transition: transform 0.5s ease-in-out;
        }
        .slider img {
            width: 100%;
            height: auto;
        }
        .slider-button {
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            background-color: rgba(0, 0, 0, 0.5);
            border: none;
            color: #fff;
            padding: 10px;
            cursor: pointer;
        }
        .slider-button.prev {
            left: 10px;
        }
        .slider-button.next {
            right: 10px;
        }
        .text-center-custom {
            text-align: center;
            margin: 20px 0;
        }
        .text-center-custom h1 {
            font-size: 2.5rem;
            margin-bottom: 10px;
            font-family: 'Montserrat', sans-serif;
        }
        .text-center-custom h2 {
            font-size: 1.5rem;
            margin-bottom: 15px;
            font-family: 'Montserrat', sans-serif;
        }
        .text-center-custom p {
            font-size: 1rem;
            margin-bottom: 20px;
            color: #000;
            background: #fff;
            padding: 10px;
            border-radius: 5px;
        }
        .btn-custom {
            display: block;
            width: 331px;
            height: auto;
            margin: 5px auto;
            background: #fff;
            color: #000;
            font-weight: bold;
            text-align: center;
            border: 1px solid #000;
            transition: background 0.3s, color 0.3s;
        }
        .btn-custom:hover {
            background: #f1f1f1;
            color: #000;
        }
        footer {
            background: rgba(0, 0, 0, 0.5);
            padding: 20px;
            text-align: center;
        }
        .social-icons {
            display: flex;
            justify-content: center;
            margin-top: 10px;
        }
        .social-icons img {
            width: 30px;
            margin-left: 10px;
        }
    </style>
</head>
<body>

    <div class="container container-custom">
        <div class="slider">
            <div class="slider-wrapper">
                <img src="https://hipnoterapisidoarjo.free.nf/pendaftaran/1.png" alt="Document Hipnoterapi Sidoarjo">
                <img src="https://hipnoterapisidoarjo.free.nf/pendaftaran/2.png" alt="Document Hipnoterapi Sidoarjo">
                <img src="https://hipnoterapisidoarjo.free.nf/pendaftaran/3.png" alt="Document Hipnoterapi Sidoarjo">
                <img src="https://hipnoterapisidoarjo.free.nf/pendaftaran/4.png" alt="Document Hipnoterapi Sidoarjo">
                <img src="https://hipnoterapisidoarjo.free.nf/pendaftaran/5.png" alt="Document Hipnoterapi Sidoarjo">
                <img src="https://hipnoterapisidoarjo.free.nf/pendaftaran/6.png" alt="Document Hipnoterapi Sidoarjo">
            </div>
            <button class="slider-button prev" onclick="prevSlide()">&#10094;</button>
            <button class="slider-button next" onclick="nextSlide()">&#10095;</button>
        </div>
        
        <div class="text-center-custom">
            <h1>MIND ART CLINIC</h1>
            <h2>Hipnoterapi Sidoarjo</h2>
            <p>
                Pendaftaran Hipnoterapi Sidoarjo<br>
                🏠Tempat Praktek: Klinik Al Kautsar<br>
                (Setro, Prambon, Kec. Prambon, Kabupaten Sidoarjo, Jawa Timur 61264)<br>
                📑Keluhan: Meluapkan Emosi | Program Diet | Gagal Move on | Berhenti Merokok |Hipno anak | Motivasi/Semangat | Dll<br>
                ADMIN 087765799323
            </p>
            <a href="https://hipnoterapisidoarjo.free.nf/tes/mingguan/" class="btn btn-custom">Cek kesehatan mental GRATIS</a>
            <a href="https://api.whatsapp.com/send/?phone=6287765799323&text=Hallo%20Hipnoterapi%20Sidoarjo,%20informasi%20pendaftaran%20hipnoterapi%20*---%3E%20informasi,%20jangan%20lupa%20save%20nomer%20admin%20untuk%20update%20terbaru%20tetang%20promo,dan%20event%20hipnoterapi,%20Salam%20sehat%20kak*%20&app_absent=0" class="btn btn-custom">Pendaftaran Hipnoterapi Sidoarjo KLINIK</a>
            <a href="https://www.instagram.com/s/aGlnaGxpZ2h0OjE3ODgzMjExMjM4MjA2MzI1?story_media_id=2557901871685337242_29457592634&igshid=MDJmNzVkMjY=" class="btn btn-custom">TESTIMONI / ULASAN CLIENT SETELAH HIPNOTERAPI</a>
            <a href="https://api.whatsapp.com/send/?phone=6287765799323&text=hallo%20admin,%20info%20hipnoterapi%20luar%20kota%20..&type=phone_number&app_absent=0" class="btn btn-custom">HIPNOTERAPI LUAR KOTA</a>
            <a href="https://api.whatsapp.com/send/?phone=6287765799323&text=Hallo%20Admin%20Info%20Tentang%20Hipnoterapi%20Online%20%20&app_absent=0" class="btn btn-custom">Daftar Hipnoterapi ONLINE / JARAK JAUH</a>
            <a href="https://www.instagram.com/s/aGlnaGxpZ2h0OjE3ODgzMjExMjM4MjA2MzI1?story_media_id=2557901871685337242_29457592634&utm_medium=copy_link" class="btn btn-custom">Testimoni HIPNOTERAPI</a>
            <a href="https://www.instagram.com/hipnoterapi.sidoarjo/" class="btn btn-custom">Instagram Hipnotis sidoarjo</a>
        </div>
    </div>

    <footer>
        <p>© 2024 Hipnoterapi Sidoarjo. Semua hak cipta dilindungi.</p>
        <p>Hubungi kami: info@hipnoterapisidoarjo.com</p>
        <p>Ikuti kami di Instagram</p>
        <div class="social-icons">
            <a
href="https://www.instagram.com/hipnoterapi.sidoarjo/"><img src="https://static.cdninstagram.com/rsrc.php/v3/yI/r/VsNE-OHk_8a.png" alt="Instagram"></a> <!-- Add other social media icons here --> </div> </footer>
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.9.2/dist/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
<script>
    let currentIndex = 0;
    const slides = document.querySelector('.slider-wrapper');
    const totalSlides = slides.children.length;

    function showSlide(index) {
        if (index >= totalSlides) {
            currentIndex = 0;
        } else if (index < 0) {
            currentIndex = totalSlides - 1;
        } else {
            currentIndex = index;
        }
        slides.style.transform = translateX(-${currentIndex * 100}%);
    }

    function nextSlide() {
        showSlide(currentIndex + 1);
    }

    function prevSlide() {
        showSlide(currentIndex - 1);
    }
</script>
</body