body { 
    font-family: Arial, sans-serif; 
    margin: 0; 
    padding: 0; 
    background: #f4f6f9; 
    text-align: center; 
}

.ad-header { 
    background: #fff; 
    padding: 15px 0; 
    border-bottom: 2px solid #cbd5e0; 
    min-height: 100px; 
    display: flex; 
    justify-content: center; 
    align-items: center; 
}
.content { 
    max-width: 800px; 
    margin: 30px auto; 
    padding: 20px; 
    background: #fff; 
    border-radius: 8px; 
    box-shadow: 0 4px 6px rgba(0,0,0,0.05); 
}
h1 { 
    color: #1a365d; 
}
p { 
    color: #4a5568; 
    line-height: 1.6; 
}