*:active {
    -webkit-tap-highlight-color: rgba(0,0,0,0);
    -moz-tap-highlight-color: rgba(0,0,0,0);
    tap-highlight-color: rgba(0,0,0,0);
}

body {
  background-color: #000;
  margin: 0;
  overflow: hidden;
}

#main_canvas_container {
  position: absolute;
  left: 0px;
  top: 0px;
  width: 100%;
  height: 100%;
}

.click:hover {
  cursor: pointer;
}

.button_area {
  position: absolute;
  bottom: 10px;
  right: 50%;
  width: 80%;
  max-width: 320px;
  transform: translateX(50%);
}

.color_button, .open_button {
  width: 25%;
  display: block;
  float: left;
}

.open_button img, .color_button img {
  width: 100%;
}

.hidden {
  visibility: hidden;
}