body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

header {
    background: #333;
    color: white;
    padding: 15px;
    text-align: center;
}


.seo-checklist {
    width: 80%;
    margin: auto;
    background: white;
    padding: 20px;
    border-radius: 5px;
}

.seo-tip {
    margin-bottom: 30px;
}

.seo-tip img {
    width: 100%;
    max-width: 500px;
    display: block;
    margin: 10px auto;
}

footer {
    text-align: center;
    background: #333;
    color: white;
    padding: 10px;
    margin-top: 20px;
}