.past,
.future {
  /* Forcing offscreen slides to be hidden seems to help with selecting elements
  and scrolling iframes */
  display: none !important;
}

.container {
  display: flex;
}
.col {
  flex: 1;
}

pre {
  /* Make tabs appear as double-spaces */
  tab-size: 2;
}

div.slides {
  /* https://stackoverflow.com/questions/19026884/flexbox-center-horizontally-and-vertically */
  height: 100%;
  padding: 0;
  margin: 0;
  display: -webkit-box;
  display: -moz-box;
  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
  align-items: center;
  justify-content: center;
}
section {
  align-items: center;
  width: 100vw;
}
section.padded {
  width: 80vw !important;
}
section section.padded {
  margin-left: 10vw;
}

/* Make code example smaller */
pre.dense {
  font-size: 0.35em !important;
}