Vintage theme for BreakDown modeled after Old Glory herself: https://ugotsta.github.io/breakdown/?css=43bff1c9c6ae8a829f67bd707ee8f142

breakdown-old-glory.css

@import url('https://fonts.googleapis.com/css?family=Calligraffitti|IM+Fell+Double+Pica|Alex+Brush');

* {
  font-family: 'Alex Brush', cursive;
  color: rgba(0,0,0,0.8);
}

.container::after {
  content: "★";
  pointer-events: none;
  left: -300px;
  bottom: -50px;
  color: darkblue;
  font-size: 50em;
  text-align: inherit;
  position: fixed;
  mix-blend-mode: color-burn;
  opacity: 0.1;
  z-index: -1;
}

code {
  background: rgba(0,0,0,0.25);
  color: rgba(0,0,0,0.7);
  font-family: 'IM Fell Double Pica', cursive;
}

#custom .info .element-count,
#custom .info .element-count code{
  font-family: 'IM Fell Double Pica', cursive;
}

#custom .content,
#custom .section .content .alternate {
  background: none;
}

#custom .inner .section {
  background: url(https://www.transparenttextures.com/patterns/natural-paper.png);
  border: 3px double white;
  box-shadow: 0 0 10px white;
  border-radius: 0px;
  mix-blend-mode: normal;
}

#custom .note {
  filter: saturate(0%);
}

#custom .inner .section::before {
  background: none;
}

#custom .section::after {
  position: absolute;
  content: ".";
  color: rgba(255,255,255,0.5);
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  background: url(https://ugotsta.github.io/breakdown/assets/paper-onion-skin.jpg);
  pointer-events: none;
  background-blend-mode: luminosity;
  mix-blend-mode: overlay;
  box-shadow: inset 0 0 20px black;
}

#custom .info a,
#custom .info .toc a,
#custom .gist-url, .css-url,
#custom .info .hide {
  font-family: 'IM Fell Double Pica';
  font-weight: bold;
  color: lightsteelblue;
}

.info .app-title .em {
    background-color: lightsteelblue;
    border-radius: 50%;
    font-family: 'IM Fell Double Pica', serif;
}

#custom .info a:hover,
#custom .info .toc a:hover {
  color: white;
}

#custom tr, #custom th {
  background: none;
}

ul li {
  padding: 2px 6px;
  border: none;
  margin: 0;
}

ul li::before {
  content: "\1f65d  ";
  color: rgba(0,0,0,0.5);
  font-size: 0.75em;
  padding-right: 8px;
}

#custom li,
#custom li:nth-child(odd) {
  background: none;
}

#wrapper .section h1,
#wrapper .section h2 {
    font-size: 1em;
    width: 100%;
}

#custom #wrapper h1 a.handle,
#custom .info h1 {
  font-family: 'IM Fell Double Pica', serif;
  font-weight: bolder;
  text-shadow: 1px 1px 2px white, 3px 3px 2px grey;
  letter-spacing: inherit;
}

#custom #wrapper h1 a.handle {
  font-size: 1.5em;
}

#custom #wrapper a.handle {
  color: rgba(0,0,0,0.8);
}

a.handle::after {
  content: "  \1f663";
  font-size: 0.85em;
}

a.handle::before {
  content: "\1f660  ";
  font-size: 0.85em;
}

#custom .cheats::after {
  content: 'cheat  \1f663';
  color: inherit;
}

#bd-cheats .section {
  padding: 2px 6px;
}

#custom .info .cheats::after {
  content: 'cheat';
  font-size: 0.6em;
  color: inherit;
}

#custom h2, 
#custom h3, 
#custom h4, 
#custom h5, 
#custom h6,
#custom .section a.handle {
  font-family: 'IM Fell Double Pica', cursive;
}

#custom .info::after {
  pointer-events: none;
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  left: 0;
  content: "";
  background: repeating-linear-gradient( 45deg, #c11, #f00 40px, #eee 40px, #fff 80px ), url(https://www.transparenttextures.com/patterns/natural-paper.png);
  mix-blend-mode: darken;
  opacity: 0.5;
  background-blend-mode: overlay;
}

#custom h1.glory:before {
  content: "\2605";
  color: blue;
  position: absolute;
  top: -30px;
  font-size: 2em;
  z-index: -1;
  left: 30px;
}

a {
  color: rgba(0,0,0,0.7);
  text-decoration: none;
  border-bottom: 1px dotted rgba(0,0,0,0.3);
}

a:hover {
  color: rgba(0,0,0,1);
  border-bottom: 1px dotted rgba(0,0,0,0.5);
}

h1 {
  text-transform: uppercase;
  font-size: 1.3em;
}

#custom .inner {
  font-size: 140%;
  box-shadow: none;
  background: none;
}

#custom .inner::before {
    position: fixed;
    content: "";
    top: 0;
    bottom: 0;
    right: 0;
    left: 0;
    /* background: radial-gradient(ellipse at center, rgba(252,255,244,1) 0%,rgb(36, 36, 36) 50%,rgba(133,142,131,1) 100%), url(https://www.transparenttextures.com/patterns/natural-paper.png); */
    background: radial-gradient(ellipse at center, rgba(252,255,244,1) 0%,rgba(223,229,215,1) 50%,rgba(133,142,131,1) 100%), url(https://www.transparenttextures.com/patterns/natural-paper.png);
    pointer-events: none;
    box-shadow: inset 0 0 60px black;
    z-index: 1;
    height: 100%;
    width: 100%;
    background-color: whitesmoke;
    mix-blend-mode: overlay;
    background-blend-mode: exclusion;
}

#custom .inner::after {
  pointer-events: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  content: "";
  background: repeating-linear-gradient( 99deg, #ccc, #aaa 80px, #eee 80px, #fff 160px );
  mix-blend-mode: overlay;
  opacity: 0.2;
  box-shadow: inset 0 0 200px black;
}

.inner h1:before {
  content: ".";
  position: absolute;
  top: -50px;
  left: 180px;
  font-size: 15em;
  text-shadow: 0px 0px 20px rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.15);
  mix-blend-mode: hard-light;
  pointer-events: none;
}

kbd, .info kbd {
  padding: 8px 12px;
  font-size: 0.9em;
  line-height: 0.75em;
  color: #444d56;
  vertical-align: middle;
  background-color: #fafbfc;
  border-bottom-color: #959da5;
  border-radius: 0;
  box-shadow: inset 0 0 20px rgba(0,0,0,0.12);
  cursor: pointer;
  mix-blend-mode: luminosity;
  filter: invert(70%);
  margin: 2px;
  font-family: 'IM Fell Double Pica', cursive;
}

#custom .info kbd {
  font-family: 'IM Fell Double Pica', serif;
  font-weight: bolder;
  color: black;
  text-shadow: 1px 1px 1px white, 2px 2px 3px rgba(0,0,0,0.75);
  border-radius: 3px;
}

/* App-specific */
connection {
  mix-blend-mode: overlay;
}

/* Animations */

@keyframes in {
    0% { opacity: 1; filter: brightness(3); box-shadow: 0 0 2px antiquewhite, inset 0 0 30px black; }
    100% { opacity: 1; filter: brightness(1); box-shadow: 0 0 100px white; }
}

@keyframes out {
    0% { opacity: 1; filter: blur(0px); }
    100% { opacity: 0; filter: blur(8px); }
}

@keyframes in-reverse {
    100% { opacity: 1; filter: brightness(3);  box-shadow: 0 0 2px antiquewhite, inset 0 0 30px black; }
    0% { opacity: 1; filter: brightness(1);  box-shadow: 0 0 150px antiquewhite; }
}

@keyframes out-reverse {
    100% { opacity: 1; filter: blur(0px); }
    0% { opacity: 0; filter: blur(8px); }
}

#custom .eq {
    transform: rotate(9deg) scale(1.5);
    mix-blend-mode: normal;
}

#custom .eq .band {
    background: rgba(70,0,0,0.2);
}

#custom .eq .band::nth-child(even) {
    background: rgba(255,255,255,0.2);
    opacity: 0.5;
}