body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', sans-serif;
    background: url('https://autotest.com.ar/wp-content/uploads/2020/04/bmw-i4-e1586883659889.jpg') no-repeat center center fixed;
    background-size: cover;
    color: white;
    height: 100vh;
}

.container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(30, 30, 30, 0.85);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 0 20px rgba(0,0,0,0.7);
    text-align: center;
}

.btn {
    display: inline-block;
    margin: 10px;
    padding: 15px 30px;
    background: linear-gradient(145deg, #999, #444);
    color: white;
    text-decoration: none;
    border-radius: 10px;
    font-size: 18px;
    transition: all 0.3s ease;
}

.btn:hover {
    background: linear-gradient(145deg, #bbb, #555);
    transform: scale(1.05);
}

.truco {
    position: absolute;
    top: 20px;
    right: 20px;
    background-color: #2196F3;
    color: white;
    padding: 10px 20px;
    border-radius: 5px;
    text-decoration: none;
}
.truco:hover::after {
    content: "Comando: 1505";
    position: absolute;
    top: 100%;
    right: 0;
    background-color: #333;
    color: #fff;
    padding: 5px 10px;
    border-radius: 5px;
    white-space: nowrap;
}