style.css

body,
html {
    margin: 0;
    padding: 0;
    font-family: Consolas, 'Menlo', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', Courier, monospace;
    font-size: 1em;
    line-height: 1.4em;
}

body.night {
    background-color: #002b36;
    color: #eee8d5;
}

body.day {
    background-color: #eee8d5;
    color: #002b36;
}

#errors {
    position: fixed;
    top: 10px;
    right: 10px;
    width: 40%;
    min-width: 33em;
    padding: 6px;
    background-color: #cb4b16;
    color: white;
}

a,
a:visited {
    color: #268bd2;
    text-decoration: none;
}

a:hover {
    font-weight: bold;
    transition-duration: 0.1s;
}

main,
footer {
    display: flex;
    justify-content: center;
    width: 96%;
    max-width: 74em;
    margin: 0 auto;
}

main>* {
    flex: 1 1 0;
    height: 90vh;
    overflow: auto;
    box-sizing: border-box;
}

footer {
    height: 6vh;
    justify-content: space-between;
}

textarea {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    border: 0;
    padding: 2em;
    outline: none;
    background-color: inherit;
    color: inherit;
}

textarea.placeholder {
    opacity: 0.7;
}

.dismissable {
    position: relative;
    padding: 2em;
}

.dismissable .close {
    position: absolute;
    top: 5px;
    right: 5px;
    cursor: pointer;
}

.highlight {
    background-color: #d33682;
    padding: 2px;
}

body.night .highlight {
    background-color: #657b83;
}

p {
    margin-top: 0;
    margin-bottom: 1.4em;
}

#tools {
    text-align: right;
    color: #868e96;
}

#sidebar {
    display: none;
    position: absolute;
    top: 0;
    right: 0;
    padding: 2em;
}

#sidebar a {
    display: block;
}

#markdownOutput {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

#markdownOutput code,
#markdownOutput pre {
    font-family: monospace;
}

.hljs {
    display: block;
    overflow-x: auto;
    padding: 0.5em;
    background: #fdf6e3;
    color: #657b83;
}

.hljs-comment,
.hljs-quote {
    color: #93a1a1;
}

.outlook-md {
    font-family: 'Calibri', sans-serif;
    background-color: white;
    color: black;
}

.outlook-md blockquote {
    border-left: 3px solid #ccc;
    padding-left: 1em;
    margin-left: 1em;
}

/* Solarized Green */

.hljs-keyword,
.hljs-selector-tag,
.hljs-addition {
    color: #859900;
}


/* Solarized Cyan */

.hljs-number,
.hljs-string,
.hljs-meta .hljs-meta-string,
.hljs-literal,
.hljs-doctag,
.hljs-regexp {
    color: #2aa198;
}


/* Solarized Blue */

.hljs-title,
.hljs-section,
.hljs-name,
.hljs-selector-id,
.hljs-selector-class {
    color: #268bd2;
}


/* Solarized Yellow */

.hljs-attribute,
.hljs-attr,
.hljs-variable,
.hljs-template-variable,
.hljs-class .hljs-title,
.hljs-type {
    color: #b58900;
}


/* Solarized Orange */

.hljs-symbol,
.hljs-bullet,
.hljs-subst,
.hljs-meta,
.hljs-meta .hljs-keyword,
.hljs-selector-attr,
.hljs-selector-pseudo,
.hljs-link {
    color: #cb4b16;
}


/* Solarized Red */

.hljs-built_in,
.hljs-deletion {
    color: #dc322f;
}

.hljs-formula {
    background: #eee8d5;
}

.hljs-emphasis {
    font-style: italic;
}

.hljs-strong {
    font-weight: bold;
}


/* --- Dark --- */

body.night .hljs {
    display: block;
    overflow-x: auto;
    padding: 0.5em;
    background: #002b36;
    color: #839496;
}

body.night .hljs-comment,
body.night .hljs-quote {
    color: #586e75;
}


/* Solarized Green */

body.night .hljs-keyword,
body.night .hljs-selector-tag,
body.night .hljs-addition {
    color: #859900;
}


/* Solarized Cyan */

body.night .hljs-number,
body.night .hljs-string,
body.night .hljs-meta .hljs-meta-string,
body.night .hljs-literal,
body.night .hljs-doctag,
body.night .hljs-regexp {
    color: #2aa198;
}


/* Solarized Blue */

body.night .hljs-title,
body.night .hljs-section,
body.night .hljs-name,
body.night .hljs-selector-id,
body.night .hljs-selector-class {
    color: #268bd2;
}


/* Solarized Yellow */

body.night .hljs-attribute,
body.night .hljs-attr,
body.night .hljs-variable,
body.night .hljs-template-variable,
body.night .hljs-class .hljs-title,
body.night .hljs-type {
    color: #b58900;
}


/* Solarized Orange */

body.night .hljs-symbol,
body.night .hljs-bullet,
body.night .hljs-subst,
body.night .hljs-meta,
body.night .hljs-meta .hljs-keyword,
body.night .hljs-selector-attr,
body.night .hljs-selector-pseudo,
body.night .hljs-link {
    color: #cb4b16;
}


/* Solarized Red */

body.night .hljs-built_in,
body.night .hljs-deletion {
    color: #dc322f;
}

body.night .hljs-formula {
    background: #073642;
}

body.night .hljs-emphasis {
    font-style: italic;
}

body.night .hljs-strong {
    font-weight: bold;
}

@media print {
    body.night, body.day {
        background-color: transparent;
        color: #000000;
    }

    textarea, .close, footer {
        display: none;
    }
}