body {
    background: #0a192f; /* Biru dongker keren */
    color: white;
    font-family: Arial;
    text-align: center;
    padding-top: 150px;
}
h1 {
    font-size: 60px;
    color: #64ffda; /* Biru muda neon */
}
.btn {
    background: #64ffda;
    color: #0a192f;
    padding: 15px 30px;
    text-decoration: none;
    border-radius: 10px;
}