* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  height: 100%;
  width: 100%;
  background-color: #000;
  display: flex;
  flex-direction: column;
}

.header {
  width: 100%;
  padding: 20px 0;
  background-color: #111;
  color: #fff;
  text-align: center;
  font-size: 2rem;
  font-weight: bold;
  font-family: Arial, sans-serif;
  z-index: 2;
}

.slideshow {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.slideshow img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: opacity 1s ease-in-out;
}