body {
    font-family: sans-serif;
    line-height: 1.7;
    max-width: 64rem;
    margin: 2rem auto;
    display: grid;
    grid-template-columns: 14rem minmax(0, 1fr);
    grid-template-areas:
        "header header"
        "sidebar content"
        "footer footer";
    gap: 1rem;
}

#header {
    background-color: #d3fffb;
    padding: 1rem;
    border-radius: 0.5rem;
    border: 1px solid #f0f0f0;
    grid-area: header;
}

#content {
    border-radius: 0.5rem;
    border: 1px solid #f0f0f0;
    background-color: white;
    grid-area: content;
}

#content h1 {
    font-size: 2rem;
    border-bottom: 1px solid #f0f0f0;
    background-color: #ecfffd;
    padding: 0.5rem;
    padding-left: 1rem;
    border-radius: 0.5rem;
    border: 1px solid #f0f0f0;
    margin-top: 0;
    margin-bottom: 1rem;
    margin-left: 0;
    margin-right: 0;
    width: 100%;
    box-sizing: border-box;
}

#content h2,
#content h3,
#content h4,
#content h5,
#content h6 {
    margin: 1.25rem 0 0.4rem;
    padding-left: 1.5rem;
    line-height: 1.3;
}

#content h2 {
    font-size: 1.5rem;
    border-left: 0.5rem solid #8fe7ff;
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;

}

#content h3 {
    font-size: 1.25rem;
}

#content h4 {
    font-size: 1.1rem;
}

#content h5,
#content h6 {
    font-size: 1rem;
}

#content p {
    padding: 0.5rem;
    padding-left: 1.5rem;
}

#content ul {
    margin: 0.5rem 0 1rem;
    padding-left: 2.5rem;
}

#content ul ul {
    margin: 0.25rem 0;
}

#content hr {
    border: none;
    border-top: 1px solid #c2c2c2;
    margin: 1rem 1.5rem;
}

#content pre {
    margin: 0.5rem 1.5rem 1rem;
    padding: 0.75rem 1rem;
    overflow: auto;
    background-color: #f6f8f8;
    border: 1px solid #f0f0f0;
    border-radius: 0.5rem;
}

#content code {
    font-family: Consolas, "Courier New", monospace;
}

#sidebar {
    padding: 1rem;
    border-radius: 0.5rem;
    border: 1px solid #f0f0f0;
    background-color: #e4fffd;
    grid-area: sidebar;
}

#sidebar ul {
    margin: 0;
    padding-left: 1.2rem;
}

#footer {
    padding: 1rem;
    border-radius: 0.5rem;
    border: none;
    border-top: 1px solid #f0f0f0;
    text-align: center;
    font-size: 0.8rem;
    grid-area: footer;
}

#footer p {
    margin: 0;
}

span.katex-display {
    border-radius: 0.5rem;
    border: 1px solid #f0f0f0;
    padding: 1rem;
    margin: 0.5rem 0;
    background-color: #f1ffff;
    display: block;
    text-align: center;
    font-size: 1.2rem;
    font-weight: bold;
    color: #333;
    margin-top: 1rem;
    margin-bottom: 1rem;
    margin-left: 0;
    margin-right: 0;
    width: 100%;
    box-sizing: border-box;
}

#content a {
    margin-left: 0.2rem;
    margin-right: 0.2rem;
    text-decoration: none;
    border-bottom: 1px solid #99ce54ef;
}

a.external:after {
    content: "\2197";
    margin-left: 0.2rem;
    margin-right: 0;
}