html, body {
    margin: 0;
    padding: 0;
}

body {
    max-width: 1080px;

    margin: 2rem auto;
    padding: 0 1rem;

    font-family:
        "Times New Roman",
        "Hiragino Mincho ProN",
        "Noto Serif CJK JP",
        serif;

    font-size: 18px;
    line-height: 1.5;

    background: white;
    color: black;
}

h1, h2, h3, h4 {
    font-weight: bold;
    margin-top: 1.8em;
}

p, ul {
    margin-top: 1em;
}

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

a:visited {
    color: purple;
}

a:hover {
    background: #eeeeee;
}

img {
    max-width: 100%;
    height: auto;
}

code, pre {
    font-family: monospace;
}

hr {
    border: none;
    border-top: 1px solid #999;
}