`copy/paste in settings > custom css`

themes

<pre>
lowercase classic monospace

* {
  font-weight: 400 !important;
  text-transform: lowercase;
  font-family: monospace;
  font-size: 94%;
}
div {
  font-size: 95%;
  font-weight: 600 !important;
  text-shadow: 0px 3px 33px #fff;
}
</pre>

<pre>
lowercase modern helvetica

* {
  font-weight: 500 !important;
  text-transform: lowercase;
  font-family: monospace;
  font-size: 100%;
  font-family: "SF Sans", helvetica, system-ui, monospace;
}
div {
  font-size: 96%;
  font-weight: 500 !important;
  line-height: 1.2rem;
  text-shadow: 0px 0px 75px #fff;
}
</pre>