html, body {
  margin: 0;
  height: 100%;
  background: #111;
  color: #eee;
  font: 17px/1.4 -apple-system, "Helvetica Neue", Helvetica, Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}

[hidden] { display: none !important; }

#stage {
  position: fixed;
  top: 0; right: 0; bottom: 0; left: 0;
  overflow: hidden;
}

#pages {
  display: -webkit-flex;
  display: flex;
  -webkit-align-items: center;
  align-items: center;
  -webkit-justify-content: center;
  justify-content: center;
  height: 100%;
}

#pages canvas {
  display: block;
  background: #fff;
}

#welcome {
  max-width: 30em;
  margin: 0 auto;
  padding: 20vh 1.5em 0;
  text-align: center;
}

#welcome h1 { font-size: 1.6em; margin: 0 0 .6em; }
#welcome p { color: #ccc; }

#bar {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  padding: 10px;
  background: rgba(30, 30, 30, .96);
  border-top: 1px solid #333;
}

#bar.away { display: none; }

#file {
  position: absolute;
  width: 1px; height: 1px;
  opacity: 0;
}

.btn {
  display: inline-block;
  margin: 4px 6px 4px 0;
  padding: 10px 16px;
  border: 0;
  border-radius: 8px;
  background: #3a3a3c;
  color: #fff;
  font: inherit;
  vertical-align: middle;
  cursor: pointer;
}

#cover-hint {
  display: block;
  font-size: 13px;
  color: #e8f0fa;
}

#cover[aria-pressed="true"] { background: #0a63c9; }
#update { background: #1d7a35; }

#where {
  float: right;
  padding: 14px 6px;
  color: #ccc;
}

#list {
  position: fixed;
  top: 0; right: 0; bottom: 0; left: 0;
  background: rgba(0, 0, 0, .7);
  overflow: auto;
  -webkit-overflow-scrolling: touch;
}

#list-box {
  max-width: 30em;
  margin: 8vh auto;
  padding: 1em 1.5em;
  background: #222;
  border-radius: 12px;
}

#list-box h2 { margin-top: 0; font-size: 1.2em; }
#list-items { list-style: none; margin: 0 0 1em; padding: 0; }

#list-items button {
  width: 100%;
  padding: 12px 4px;
  border: 0;
  border-bottom: 1px solid #333;
  background: none;
  color: #fff;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

#message {
  position: fixed;
  top: 40%;
  left: 10%; right: 10%;
  margin: 0;
  padding: 1em;
  background: #2b2b2e;
  border-radius: 12px;
  text-align: center;
}