body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f4f9ff;
    color: #222;
}
.header {
    background-color: #0066cc;
    color: white;
    padding: 1rem;
    text-align: center;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    height: 50px;
}
.btn {
    background-color: #fff;
    color: #0066cc;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
}
.hero {
    padding: 5rem 2rem;
    text-align: center;
    background-image: url('https://hi88app77.com/default/assets/image/bg.png');
    background-size: cover;
    background-position: center;
    color: white;
    text-shadow: 1px 1px 2px #000;
}
.footer {
    background-color: #0066cc;
    color: white;
    text-align: center;
    padding: 1rem;
}