.ctrl {
  width: 150px;
  height: 150px;
  background: rgb(26 29 33 / 39%);
  border-radius: 30px;
  cursor: grab;
  position: absolute;
  left: calc(50% - 75px);
  bottom: 80px;
  z-index: 3;
}
.ctrl * {
  -webkit-touch-callout: none; /* iOS Safari */
  -webkit-user-select: none; /* Safari */
  -khtml-user-select: none; /* Konqueror HTML */
  -moz-user-select: none; /* Old versions of Firefox */
  -ms-user-select: none; /* Internet Explorer/Edge */
  user-select: none; /* Non-prefixed version, currently supported by Chrome, Edge, Opera and Firefox */
}