A little demo I made to show what's possible with remark, a tool for rendering markdown as an HTML slideshow.

To run you'll need a light http server, Python's http.server works well. To run:

python -m http.server

Some keyboard shortcuts:

• P - Presenter mode
• C - Clone for multiple screen
• h - help
• f - fullscreen

• it's free
• it's configurable, plus good to play around with HTML and CSS now and then
• can be hosted on your website
• instant dark mode with Dark Reader (a chrome plugin)

The default screen ratio can be changed to 16:9 (see the index.html file)

• Hugo - integrate with Hugo

As mentioned in the documentation, printing to PDF can be done using Google Chrome's print but will not have a great layout. To correct this, add the following to the CSS:

@page {
  size: 1210px 681px;
  margin: 0;
}

@media print {
  .remark-slide-scaler {
    width: 100% !important;
    height: 100% !important;
    transform: scale(1) !important;
    top: 0 !important;
    left: 0 !important;
  }
}

Note that the CSS I've included here is a real mish-mash of me trying things out!