body {
    font-family: 'Arial', sans-serif;
    background-color: #f0f0f0;
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    background-color: white;
    border-radius: 15px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    padding: 30px;
    max-width: 800px;
    width: 100%;
}

#timeline {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 30px;
}

.era {
    background-color: #f9f9f9;
    border-left: 5px solid #007bff;
    padding: 15px;
    border-radius: 5px;
    transition: transform 0.3s ease;
}

.era-content {
    display: flex;
    align-items: center;
    gap: 20px;
}

.era-image {
    width: 150px;
    height: 150px;
    object-fit: cover;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.era:hover {
    transform: scale(1.02);
}

h1 {
    text-align: center;
    color: #333;
}

#circle-animation {
    width: 100%;
    height: 300px;
    background-color: #e9ecef;
    border-radius: 10px;
}

@media (max-width: 600px) {
    .container {
        padding: 15px;
    }
    
    .era {
        padding: 10px;
    }
    
    .era-content {
        flex-direction: column;
        text-align: center;
    }
    
    .era-image {
        width: 100px;
        height: 100px;
    }
}