style.css

body {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  margin: 0;
}

#viewerCanvas {
  background-color: #cccccc;
  border: 1px solid gray;
  outline: none;
  touch-action: none;
  width: 100%;
  height: 100%;
  display: block;
}

#optionsDiv {
  position: absolute;
  top: 7%;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px;
}

#viewerProgressDiv {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px;
  background-color: #cccccc;
  border-radius: 10px;
}

#viewerProgress {
  width: 100%;
}

#viewerProgressLabel {
  margin-top: 2px;
  display: block;
  margin-left: 10px
}

#loadingContainer {
  position: absolute;
  bottom: 1%;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

select {
  font-size: larger;
  border-radius: 10px;
  padding: 5px 10px 5px 10px;
}