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

.ready-scene {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: #000;
  z-index: 10000;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

.ready-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  object-fit: cover;
  pointer-events: none;
  user-select: none;
  opacity: 0;
  transition: opacity 6s ease-in-out;
}

/* Centered Button, hold y' vertical center */
.ready-continue-btn {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  top: 40%;
  /* If you want to keep y' offset, e.g. move a bit up/down, adjust top */
  /* top: calc(50% + 100px); /* Example to move below center */
  padding: 1rem 2rem;
  font-size: 1.2rem;
  background-color: #ff0000;
  color: #fff;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 12s ease-in-out, background 0.2s;
  z-index: 10001;
}
.ready-continue-btn:hover {
  background-color: #880000;
}