body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: Arial, sans-serif;
    background: url('gym.jpg') no-repeat center center fixed;
    background-size: cover;
    color: white;
}

.overlay {
    background-color: rgba(0, 0, 0, 0.7);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.content h1 {
    font-size: 3em;
    margin-bottom: 0.5em;
}

.content p {
    font-size: 1.5em;
    margin-bottom: 1em;
}

#countdown {
    font-size: 1.2em;
    margin: 1em 0;
}

.buttons .btn {
    display: inline-block;
    margin: 0.5em;
    padding: 0.7em 1.5em;
    color: white;
    background-color: #e91e63;
    text-decoration: none;
    border-radius: 5px;
}

.buttons .whatsapp {
    background-color: #25D366;
}