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

body {
  font-family: sans-serif;
}

header {
  background-color: #333;
  color: #fff;
  padding: 20px;
  text-align: center;
}

main {
  display: flex;
  justify-content: center;
  align-items: center;
  height: calc(100vh - 140px);
}

.slider-container {
  width: 70%;
  position: relative;
  overflow: hidden;
}

.slider-item {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1s ease-in-out;
}

.slider-item.active {
  opacity: 1;
}

.slider-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.footer {
  background-color: #333;
  color: #fff;
  padding: 20px;
  text-align: center;
}