example-custom.css

 /* Header ----------------------------------------------------------------- */

header.section-header {
  background-image: url('../img/energyworx-logo.png');
  background-repeat: no-repeat;
  background-position: right;
  background-size: 6.7em;
  border-bottom: 1px solid var(--r-selection-background-color);
  top: -15px;
}

header.section-header::before {
  content: 'Automated tests, by Standard project team';
  font-size: 0.67em;
  font-style: italic;
  position: relative;
  vertical-align: sub;
}

section.present {
  margin-top: 15px;
}

.admonition:before {
  position: absolute;
  bottom: 70%;
  left: -20px;
  font-size: 1.7rem;
  line-height: 1em;
  border-radius: 50%;
  padding-block: 2px;
  padding-inline: 4px;
  color: var(--r-background-color);
}

.admonition {
  margin-top: 1.2rem;
}

.reveal pre{
  width: unset;
}

html.print-pdf header.section-header {
  display: none;
}

:root {
  --r-main-font-size: 1.22rem;
  --r-block-margin: 0.1rem;
}