.per-container {
  position: relative;
  width: 100%;
  max-width: 100%;
  height: 90vh;
  background: #000;
  color: #fff;
  overflow: hidden;
}

#per-toolbar {
  position: absolute;
  bottom: 20px;   /* udaljenost od dna */
  right: 20px;    /* udaljenost od desnog ruba */
  z-index: 999;
	transition: bottom 0.2s, right 0.2s;
}

#per-toolbar button {
  padding: 8px 12px;
  background: rgba(255, 255, 255, 1);
  border: none;
  color: black;
  border-radius: 5px;
  cursor: pointer;
}

#per-reader {
  width: 100%;
  height: 100%;
}

#per-frame,
#epub-reader {
  width: 100%;
  height: 100%;
  border: none;
}