body {
    font-family: Arial, sans-serif;
    background-color: #eaeaea;
    margin: 0;
    padding: 20px;
    line-height: 1.6;
}

.paper {
    max-width: 800px;
    margin: 40px auto;
    background-color: #fff;
    padding: 40px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
    border: 1px solid #ddd;
    border-radius: 4px;
}

/* Headings */
h1, h3 {
    color: #004080;
    font-weight: bold;
}

h1 {
    font-size: 2.5em;
    border-bottom: 2px solid red;
    padding-bottom: 10px;
}

h3 {
    font-size: 1.5em;
    margin-top: 30px;
}

p {
    font-weight: bold;
    margin-bottom: 15px;
}

ul {
    list-style-type: square;
    padding-left: 20px;
    margin-bottom: 20px;
}

ol {
    list-style-type: decimal;
    padding-left: 20px;
    margin-bottom: 20px;
}

dl dt {
    font-weight: bold;
    margin-top: 10px;
}

dl dd {
    margin-left: 20px;
    font-style: italic;
    margin-bottom: 10px;
}

a {
    color: #0066cc;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

pre, code {
    font-family: Consolas, monospace;
    background-color: #eaeaea;
    padding: 5px;
    border-radius: 4px;
}

pre {
    overflow-x: auto;
    padding: 10px;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 15px 0;
}

button {
    background-color: #004080;
    color: #fff;
    border: none;
    padding: 10px 20px;
    font-size: 1em;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    background-color: #0059b3;
}

.text-center {
    text-align: center;
}

.mt-20 {
    margin-top: 20px;
}

.mb-20 {
    margin-bottom: 20px;
}