custom.css

html body {
  background: #1c1e20;
  background: -moz-radial-gradient(center, circle cover, #466BB0 0%, #1c1e20 100%);
  background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%, #466BB0), color-stop(100%, #1c1e20));
  background: -webkit-radial-gradient(center, circle cover, #466BB0 0%, #1c1e20 100%);
  background: -o-radial-gradient(center, circle cover, #466BB0 0%, #1c1e20 100%);
  background: -ms-radial-gradient(center, circle cover, #466BB0 0%, #1c1e20 100%);
  background: radial-gradient(center, circle cover, #466BB0 0%, #1c1e20 100%);
  background-color: #466BB0;
}

.reveal section pre {
    background-color: #3F3F3F !important;
    padding: 5px !important;
    font-size: 0.65em;
    overflow: hidden;
}

.reveal section pre code {
  overflow-x: hidden;
  max-height: none;
}