html, body {
  margin: 0;
  padding: 0;
  background: #fff;
  overflow: hidden;
  font-family: sans-serif;
  background-image: url("https://the-iconomist.net/v/xc/background/bg_1.jpg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

#canvas {
  position: relative;
  width: 100vw;
  height: 100vh;
}

.layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  object-fit: cover; /* chave aqui */

  opacity: 0;
  transition: opacity 5s ease;
  pointer-events: none;
}

.visible {
  opacity: 1;
}

#back-button {
  position: fixed;
  bottom: 20px;
  left: 20px;
  text-decoration: none;
  color: black;
  font-size: 14px;
  opacity: 0.6;
}

#back-button:hover {
  opacity: 1;
}