style.css

body {
  padding: 0;
  margin: 0;
}

.app {
  height: 100vh;
  background-color: #282c34;
  color: white;
  font-family: monospace;
  overflow: hidden;
}

.viewer {
  position: static;
}

.viewer img {
  max-width: 100vw;
  max-height: 100vh;
  margin-top: auto;
  margin-bottom: auto;
}

.bar {
  position: fixed;
  top: 0;
  margin-top: 0;
  width: 100%;
  background: rgba(0,0,0,0.5);
}

.bar progress {
  background-color: #eee;
  border: 1px solid white;
}

.media-controls {
  display: inline-block;
}

.help-button {
  position: absolute;
  right: 0;
  top: 0;
}

.help-dialog {
  position: absolute;
  top: 0;
  right: 0;
  color: white;
  background-color: #555;
  padding: 30px;
}

.help-dialog table {
  color: white;
}

#play-or-pause {
  text-align: center;
  width: 60px;
}