#robot-canvas-wrapper {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
}

#robotCanvas {
  width: 100%;
  height: 100%;
  background: transparent;
}

.image-container {
  width: 600px;
  height: 300px;
  overflow: hidden;
  position: relative;
}

.image-container img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%; /* keep width full */
  height: auto;
  animation: scrollY 10s linear infinite alternate;
}

@keyframes scrollY {
  from {
    top: 0;
  }
  to {
    top: -300px; /* 900 - 500 = 400 */
  }
}