suCSS.css

:root,
::backdrop {
  /* set sans-serif & mono fonts */
  --sans-font: -apple-system, BlinkMacSystemFont, "Avenir Next", Avenir,
    "Nimbus Sans L", Roboto, "Noto Sans", "Segoe UI", Arial, Helvetica,
    "Helvetica Neue", sans-serif;
  --mono-font: Consolas, Menlo, Monaco, "Andale Mono", "Ubuntu Mono", monospace;
  --standard-border-radius: 5px;

  /* default colors */
  --bg: #EEEEEE;
  --bg-light: #CBCDCD;
  --text: #41474E;
  --text-light: #646868;
  --accent: #D26878;
  --accent-light: #e08f67;
  --accent-text: var(--bg);
  --border: #646868;
  --link: #5690AF;
}

/* theme media queries */
@media (prefers-color-scheme: dark) {
  :root,
  ::backdrop {
    color-scheme: dark;
    --bg: #222529;
    --bg-light: #464949;
    --text: #D6D6D6;
    --text-light: #DBD5BC;
    --accent: #78B6AD;
    --accent-light: #87C9E5;
    --accent-text: var(--bg);
    --border: #DBD5BC;
    --link: #E2AEA2;
  }
  img,
  video {
    opacity: 0.8;
  }
}

@media (prefers-color-scheme: light) {
  :root,
  ::backdrop {
    color-scheme: light;
    --bg: #EEEEEE;
    --bg-light: #CBCDCD;
    --text: #41474E;
    --text-light: #646868;
    --accent: #D26878;
    --accent-light: #e08f67;
    --accent-text: var(--bg);
    --border: #646868;
    --link: #5690AF;
  }
}

[data-theme="light"] {
  /* default (light) theme */
  color-scheme: light;
    --bg: #EEEEEE;
    --bg-light: #CBCDCD;
    --text: #41474E;
    --text-light: #646868;
    --accent: #D26878;
    --accent-light: #e08f67;
    --accent-text: var(--bg);
    --border: #646868;
    --link: #5690AF;
}

[data-theme="dark"] {
  color-scheme: dark;
    --bg: #222529;
    --bg-light: #464949;
    --text: #D6D6D6;
    --text-light: #DBD5BC;
    --accent: #78B6AD;
    --accent-light: #87C9E5;
    --accent-text: var(--bg);
    --border: #DBD5BC;
    --link: #E2AEA2;
}

::selection,
::-moz-selection {
  color: var(--bg);
  background: var(--accent)
}

/* chromium scrollbars */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
  overflow: visible;
}
::-webkit-scrollbar-thumb {
  background: var(--accent);
  width: 12px;
}
::-webkit-scrollbar-track {
  background: var(--bg-light);
}

/* firefox scrollbars */
* {
  scrollbar-color: var(--accent) var(--bg-light);
  scrollbar-width: thin;
  scrollbar-height: thin;
}

html {
  color-scheme: light dark;
  font-family: var(--mono-font);
  scroll-behavior: smooth;
}

body {
  min-height: 100svh;
  color: var(--text);
  background-color: var(--bg);
  font-size: 1rem;
  display: grid;
  grid-template-columns: 1fr min(45rem, 90%) 1fr;
  grid-template-rows: auto 1fr auto;
  grid-row-gap: .625rem;
}
body > * {
  grid-column: 2;
}

body > footer {
  color: var(--text-light);
  font-size: .875;
}

/* Format headers */
h1 {
  font-size: 2rem;
}
h2 {
  font-size: 1.75rem;
}
h3 {
  font-size: 1.5rem;
}
h4 {
  font-size: 1.25rem;
}
h5 {
  font-size: 1rem;
}
h6 {
  font-size: .75rem;
}

h1, h2,
h3, h4,
h5, h6 {
  margin: .5em 0  .5em 0;
}

/* Fix line height when title wraps */
h1, h2, h3 {
  line-height: 1.1;
}

h1::before, h2::before,
h3::before, h4::before, 
h5::before, h6::before {
  color: var(--accent);
  content: '# '
}

@media only screen and (max-width: 720px) {
  h1 {
    font-size: 1.5rem;
  }
  h2 {
    font-size: 1.25rem;
  }
  h3 {
    font-size: 1rem;
  }
  h4 {
    font-size: .75rem;
  }
  h5 {
    font-size: .5rem;
  }
  h6 {
    font-size: .25rem;
  }
}

p {
  margin: 1rem 0;
}

/* format links */
a,
a:visited {
  text-decoration: none;
  border-radius: .125rem;
  color: var(--link);
}

a:hover {
  background-color: var(--link);
  color: var(--bg);
}

/* format lists */
ul {
  list-style: none;
  margin-top: .25rem;
  margin-bottom: .25rem;
}

ol {
  list-style-type: decimal;
  margin-top: .25rem;
  margin-bottom: .25rem;
}

li {
  margin-bottom: .125rem;
}

ul li::marker {
  content: '» ';
  color: var(--accent)
}

ul li:hover::marker {
  content: '# ';
  font-weight: 700;
  color: var(--link)
}

ol li::marker {
  color: var(--accent);
}

ol li:hover::marker {
  font-weight: 700;
  color: var(--link)
}

/* Use flexbox to allow items to wrap, as needed */
header > nav ul,
header > nav ol {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  align-content: space-around;
  justify-content: right;
  list-style-type: none;
  margin: .5rem 0 0 0;
  padding: 0;
  gap: 1rem;
}

/* List items are inline elements, make them behave more like blocks */
header > nav ul li,
header > nav ol li {
  display: inline-block;
}

/* Consolidate box styling */
aside, details, pre, progress {
  background-color: var(--bg-light);
  border-radius: var(--standard-border-radius);
}

aside {
  font-size: 1rem;
  width: 35%;
  padding: 0 10px;
  margin-inline-start: 10px;
  float: right;
}
*[dir="rtl"] aside {
  float: left;
}

/* make aside full-width on mobile */
@media only screen and (max-width: 720px) {
  aside {
    width: 100%;
    float: none;
    margin-inline-start: 0;
  }
}

details {
  padding: .5rem;
}

summary {
  cursor: pointer;
  font-weight: bold;
  word-break: break-all;
}

details[open] > summary + * {
  margin-top: 0;
}

details[open] > summary {
  margin-bottom: 0.5rem;
}

details[open] > :last-child {
  margin-bottom: 0;
}

/* Format tables */
table {
  border-collapse: collapse;
  margin: 1.5rem 0;
  display: block;
  overflow-x: auto;
  white-space: nowrap;
}

td,
th {
  border: 1px solid var(--border);
  text-align: start;
  padding: 0.5rem;
}

th {
  background-color: var(--bg-light);
  font-weight: bold;
}

tr:nth-child(even) {
  background-color: var(--bg-light);
}

table caption {
  text-align: left;
  font-weight: bold;
  margin: 0 0 .4rem 1rem;
}

/* format forms */
fieldset {
  border: 1px dashed var(--accent);
  border-radius: var(--standard-border-radius);
}

fieldset > legend {
  color: var(--accent);
}

textarea,
select,
input,
button,
.button {
  font-size: inherit;
  font-family: inherit;
  padding: .25rem;
  border-radius: var(--standard-border-radius);
  box-shadow: none;
  max-width: 100%;
  display: inline-block;
}

textarea,
select,
input {
  color: var(--text);
  background-color: var(--bg);
  border: 1px dashed var(--border);
}

label {
  display: block;
}

fieldset label {
  margin: 0 0 .3rem 0;
}

textarea {
  max-width: 43.5rem;
  resize: both;
}

textarea:not([cols]) {
  width: 100%;
}

@media only screen and (max-width: 720px) {
  textarea,
  select,
  input {
    width: 100%;
  }
}

/* format buttons */
button,
.button,
a.button,
input[type="submit"],
input[type="reset"],
input[type="button"],
label[type="button"] {
  border: 1px solid var(--accent);
  background-color: var(--accent);
  color: var(--accent-text);
  padding: 0.5rem 0.9rem;
  text-decoration: none;
  line-height: normal;
}

.button[aria-disabled="true"], 
input:disabled,
textarea:disabled,
select:disabled,
button[disabled] {
  cursor: not-allowed;
  background-color: var(--bg-light);
  border-color: var(--bg-light);
  color: var(--text-light);
}

input[type="range"] {
  padding: 0;
  color: var(--accent);
}

abbr[title] {
  cursor: help;
  text-decoration-line: underline;
  text-decoration-style: dotted;
}

button:enabled:hover,
.button:not([aria-disabled="true"]):hover,
input[type="submit"]:enabled:hover,
input[type="reset"]:enabled:hover,
input[type="button"]:enabled:hover,
label[type="button"]:hover {
  background-color: var(--accent-light);
  border-color: var(--accent-light);
  cursor: pointer;
}

.button:focus-visible,
button:focus-visible:where(:enabled),
input:enabled:focus-visible:where(
  [type="submit"],
  [type="reset"],
  [type="button"]
) {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

/* checkbox and radio button style */
input[type="checkbox"],
input[type="radio"] {
  vertical-align: middle;
  position: relative;
  width: min-content;
  width: 14px;
  height: 14px;
}

input[type="checkbox"] + label,
input[type="radio"] + label {
  display: inline-block;
}

input[type="radio"] {
  border-radius: 100%;
}

input[type="checkbox"]:checked,
input[type="radio"]:checked {
  background-color: var(--accent);
}

@media only screen and (max-width: 720px) {
  textarea,
  select,
  input {
    width: 100%;
  }
}

input[type="color"] {
  height: 2.5rem;
  padding:  0.2rem;
}

input[type="file"] {
  border: 0;
}

/* misc body elements */
hr {
  border: 1px dashed var(--accent);
  margin: .5rem 0 .5rem 0;
}

mark {
  padding: 0 .25em 0 .25em;
  border-radius: var(--standard-border-radius);
  background-color: var(--accent);
  color: var(--bg);
}

mark a {
  color: var(--link);
}

img,
video {
  max-width: 90%;
  height: auto;
  padding: .125rem;
  border: dashed 2px var(--accent);
  border-radius: 15px;
}

figure {
  margin: 0;
  display: block;
  overflow-x: auto;
}

figcaption {
  text-align: left;
  font-size: .875rem;
  color: var(--text-light);
  margin: 0 0 1rem 1rem;
}

blockquote {
  margin: 0 0 0 1.25rem;
  padding: .5rem 0 0 .5rem;
  border-inline-start: .375rem solid var(--accent);
  color: var(--text-light);
  font-style: italic;
}

cite {
  font-size: .875rem;
  color: var(--text-light);
  font-style: normal;
}

dt {
    color: var(--text-light);
}

code, pre,
pre span,
kbd, samp {
  font-family: var(--mono-font);
}


pre {
  border: 1px solid var(--accent);
  max-height: 30rem;
  padding: .625rem;
  overflow: auto;
  font-style: monospace;
  white-space: pre-wrap; 
}

p code,
li code,
div code {
  padding: 0 .125rem 0 .125rem;
  border-radius: 3px;
  color: var(--bg);
  background-color: var(--text);
}

pre code {
  padding: 0;
  border-radius: 0;
  color: inherit;
  background-color: inherit;
}

iframe {
  max-width: 90%;
}

/* progress bars */
progress {
  width: 100%;
}

progress:indeterminate {
  background-color: var(--bg-light);
}

progress::-webkit-progress-bar {
  border-radius: var(--standard-border-radius);
  background-color: var(--bg-light);
}

progress::-webkit-progress-value {
  border-radius: var(--standard-border-radius);
  background-color: var(--accent);
}

progress::-moz-progress-bar {
  border-radius: var(--standard-border-radius);
  background-color: var(--accent);
  transition-property: width;
  transition-duration: 0.3s;
}

progress:indeterminate::-moz-progress-bar {
  background-color: var(--bg-light);
}

dialog {
  max-width: 40rem;
  margin: auto;
}

dialog::backdrop {
  background-color: var(--bg);
  opacity: 0.8;
}

@media only screen and (max-width: 720px) {
  dialog {
    max-width: 100%;
    margin: auto 1em;
  }
}

/* superscript & subscript */
/* prevent scripts from affecting line-height. */
sup, sub {
  vertical-align: baseline;
  position: relative;
}

sup {
  top: -0.4em;
}

sub { 
  top: 0.3em; 
}