* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Times New Roman", serif;
    background-color: #f0f0f0;
    color: black;
    margin: 0;
    padding: 0;
}

h1, h2, h3, h4, h5, h6 {
    color: black;
    font-family: "Arial", sans-serif;
    margin-top: 20px;
    margin-bottom: 10px;
    text-decoration: underline;
    text-align: center;
    position: sticky;
    padding: 15px;
    top: 0;
    z-index: 1000;
}

p, li, dt, dd, blockquote {
    font-family: "Courier New", monospace;
    font-size: 14px;
    line-height: 1.6;
    color: black;
}

a:link {
    color: blue;
    text-decoration: underline;
}

a:visited {
    color: purple;
    text-decoration: underline;
}

a:hover {
    color: red;
    text-decoration: underline;
}

a:active {
    color: orange;
    text-decoration: underline;
}

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

blockquote {
    border-left: 3px solid gray;
    padding-left: 10px;
    margin: 10px 0;
}

hr {
    border: none;
    border-top: 2px solid #ccc;
    margin: 20px 0;
}

pre, code {
    font-family: "Courier New", monospace;
    background-color: #e0e0e0;
    padding: 10px;
    display: block;
    margin: 10px 0;
    white-space: pre-wrap;
}

table {
    width: 100%;
    border-collapse: collapse;
    border: 1px solid black;
    margin-top: 20px;
}

th, td {
    border: 1px solid black;
    padding: 8px;
    text-align: left;
}

caption {
    font-weight: bold;
    margin-bottom: 5px;
}

input, textarea, select, button {
    font-family: "Courier New", monospace;
    font-size: 14px;
    padding: 5px;
    margin-top: 5px;
    border: 1px solid black;
    background-color: #f8f8f8;
    color: black;
}

fieldset {
    border: 1px solid #ccc;
    padding: 10px;
    margin-top: 10px;
}

legend {
    font-weight: bold;
}

img {
    border: 2px solid black;
    padding: 2px;
}

header, footer, section, article, aside, main {
    padding: 10px;
    border: 1px solid #ccc;
    background-color: #f9f9f9;
    margin-top: 10px;
}

nav {
    background-color: #f9f9f9;
    padding: 10px;
    border: 1px solid #ccc;
    text-align: center;
}

nav ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
}

nav ul li {
    display: inline;
    margin-right: 20px;
}

nav ul li a {
    font-family: "Arial", sans-serif;
    color: blue;
    text-decoration: underline;
}

main {
    padding: 20;
}

@media (max-width: 600px) {
    header, nav a {
        font-size: 18px;
    }
}