css
body {
    background-color: #333;
    color: #f0f0f0;
    font-family: 'Open Sans', sans-serif;
    font-size: 18px;
    line-height: 1.5;
}

a {
    color: #00f;
    text-decoration: none;
}

a:hover {
    color: #0ff;
}

h1 {
    font-weight: bold;
    text-align: center;
    margin-bottom: 10px;
}

h2 {
    font-weight: bold;
    text-align: center;
    margin-bottom: 10px;
}

h3 {
    font-size: 18px;
    margin-top: 10px;
    margin-bottom: -10px;
}

h4 {
    font-weight: bold;
    text-align: center;
    margin-bottom: 10px;
}

h5 {
    font-size: 16px;
    margin-top: 10px;
    margin-bottom: -10px;
}

h6 {
    font-weight: bold;
    text-align: center;
    margin-top: 10px;
    margin-bottom: -10px;
}

body > * {
    font-family: 'Open Sans', sans-serif;
}

code {
    font-weight: normal;
    border: 1px solid black;
    background-color: #f0f0f0;
    padding: 2px 5px 2px 5px;
}

pre {
    font-family: 'Open Sans', monospace;
    font-size: 16px;
    font-weight: normal;
    border: 1px solid black;
    background-color: #f0f0f0;
}

img {
    width: 100%;
    height: auto;
    max-width: 100%;
    margin: 10px 0;
}

table {
    border-collapse: collapse;
    border: 1px solid black;
}

th {
    border: 1px solid black;
    padding: 5px 10px;
    background-color: #f0f0f0;
}

td {
    border: 1px solid black;
    padding: 5px 10px;
}

table tr {
    border-bottom: 1px solid black;
}

tr:last-child {
    border-bottom: 0;
}

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

li {
    margin: 10px;
    padding: 5px 5px;
}

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