big.css

html {
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, avenir next, avenir, helvetica neue, helvetica, Ubuntu, roboto, noto, segoe ui, arial, sans-serif;
  font-weight: 700;
  margin: 0;
  padding: 0;
}

h1,
h2,
h3,
p {
  margin: 0;
}

em {
  font-style: normal;
}

.nowrap {
  white-space: nowrap;
}

* {
  box-sizing: border-box;
}

div.slide-container {
  background-size: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

div.slide {
  cursor: pointer;
  cursor: hand;
}

div.imageText {
  text-shadow: 0 0 5px rgba(0, 0, 0, 0.2);
}

/* normally not good, but ok in context of full screen directional navigation */
.talk-mode .slide:focus {
  outline: 0;
}

body.talk-mode {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
}

body.print-mode {
  background: #fff;
  color: #000;
  font-weight: normal;
  padding: 0px;
}

body.print-mode div.sub-container {
  padding: 10px 20px;
  display: flex;
  flex-flow: row wrap;
  break-inside: avoid;
}

ul.notes-list {
  display: inline-block;
  float: left;
  vertical-align: top;
}

body.print-mode div.slide-container {
  border: 1px solid #000;
}

body.jump-mode {
  padding: 10px;
}

body.jump-mode div.sub-container {
  display: inline-block;
  vertical-align: top;
  padding: 2px;
}

body.jump-mode div.slide-container {
  border: 1px solid rgba(255, 255, 255, 0.2);
  cursor: pointer;
}

body.jump-mode div.slide-container:hover {
  border: 1px solid rgba(255, 255, 255, 0.8);
}

.layout {
  display: grid;
}

.layout div {
  display: flex;
  align-items: center;
}

.layout img {
  object-fit: contain;
  width: 100%;
  height: 100%;
}

div.slide > img:only-child,
div.slide > canvas:only-child,
div.slide > video:only-child {
  width: 100%;
}