*{
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
}

.head {
    background: #007BFF;
    color: white;
    padding: 20px;
    text-align: center;
}

.body {
    padding: 20px;
    max-width: 800px;
    margin: 0 auto;
}

h1, h2, h3 {
    margin: 10px 0;
}

ol, ul {
    padding-left: 20px;
}

code {
    background: #e9ecef;
    padding: 2px 5px;
    border-radius: 3px;
}

pre {
    background: #e9ecef;
    padding: 10px;
    border-radius: 5px;
    overflow-x: auto;
}

a {
    color: #007BFF;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.footer {
    text-align: center;
    padding: 10px;
    background: #007BFF;
    color: white;
    position: relative;
    bottom: 0;
    width: 100%;
}