html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: #0b0b10;
  overflow: hidden;
}

#wrap {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

#mutebtn {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 26px;
  height: 26px;
  padding: 0;
  font-size: 13px;
  line-height: 1;
  color: #f4f4f4;
  background: rgba(26, 28, 44, 0.55);
  border: 1px solid rgba(244, 244, 244, 0.35);
  border-radius: 5px;
  cursor: pointer;
  opacity: 0.55;
  transition: opacity 0.15s;
  z-index: 5;
}
#mutebtn:hover { opacity: 1; background: rgba(26, 28, 44, 0.85); }

#screen {
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  background: #000;
}