html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
}

.slideshow {
  position: relative;
  width: 100%;
  height: 100%;
}

.slideshow img {
  position: absolute;
  inset: 0;                     /* shorthand für top/right/bottom/left = 0 */
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 1s ease-in-out;
  z-index: 1;
}

.slideshow img.active {
  opacity: 1;
  z-index: 2;
}

/* Overlay für Text mit Countdown */
.overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(0, 0, 0, 0.6);
  padding: 1.5rem 2rem;
  border-radius: 8px;
  color: #fff;
  text-align: center;
  font-family: Avenir, sans-serif;
  z-index: 5;
  max-width: 90%;
  box-sizing: border-box;
}

.overlay h1 {
  margin: 0 0 0.5rem;
  font-size: 2rem;
}

.overlay p {
  margin: 0;
  font-size: 1.1rem;
}

.overlay a {
  color: #00aced;
  text-decoration: underline;
}