body {
  margin: 0;
  background: white;
  overflow: hidden;
}

/* effet nostalgique global */
body::after {
  content: "";
  position: fixed;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, transparent 60%, black 100%);
  pointer-events: none;
}

/* grain / film */
body::before {
  content: "";
  position: fixed;
  width: 100%;
  height: 100%;
  background: url("https://www.transparenttextures.com/patterns/noise.png");
  opacity: 0.2;
  pointer-events: none;
}

/* image centrale */
.center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.main-image {
  width: 400px;
  filter: contrast(1.1) brightness(0.9) sepia(0.2);
  box-shadow: 0 0 40px rgba(255,255,255,0.2);
}
.bubble {
  position: absolute;
  width: 100px;
  height: 100px;
  border-radius: 50%;
  object-fit: cover;
  opacity: 0.8;
  animation: float 20s infinite linear;

  cursor: pointer;
  transition: all 0.4s ease;

  box-shadow:
    inset 0 0 20px rgba(255,255,255,0.4),
    0 0 20px rgba(255,200,150,0.3);
}