body {
  padding: 0;
  margin: 0;
  overflow: hidden;
  background-color: black;
}

#p5_loading {
  position: fixed;
  top: 0px;
  left: 0px;
  width: 100%;
  height: 100%;
  background-color: black;
}

.top-left {
  position: fixed;
  top: 0px;
  left: 0px;
  padding: 0.5em;

  transition-property: all;
  transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
  transition-duration: 300ms;
}

.top-right {
  position: fixed;
  top: 0px;
  right: 0px;
  padding: 0.5em;
}

.shader-btn {
  padding: 5px 0.75em 5px 0.75em;
  border: 0;
  transform: scale(1);
  opacity: 0.65;
  background-color: rbga(240, 240, 240, 0.65);
  color: rgba(15, 15, 15, 1.0);
  white-space: nowrap;
  border-radius: 0.25rem;
  box-shadow: 0px 0px 3px #bbbbbb;

  font-size: 1rem;

  transition-property: all;
  transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
  transition-duration: 300ms;
}

.shader-btn:hover {
  transform: scale(0.9);
  opacity: 0.90;
  background-color: rbga(240, 240, 240, 0.80);
  box-shadow: 0px 0px 3px #eeeeee;
}

/* light gray #bbbbbb */
/* off white #F0F0F0 */
/* off black #0F0F0F */

.overlay {
  position: fixed;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;

  transition-property: all;
  transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
  transition-duration: 300ms;
}

.overlay > .center {
  margin: 0 auto;
}

.menu-item-closed {
  transform: scale(0);
}

.menu-item-open {
  transform: scale(1);
}