* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
}

body {
  font-family: Arial, Helvetica, sans-serif;
}

.app {
  background-color: #eee;
  padding: 50px 0;
  height: 100vh;
}

.title {
  text-align: center;
  font-size: 40px;
  margin: 0 auto 20px;
  line-height: 2;
}

.slider-container {
  width: 800px;
  height: 450px;
  position: relative;
  margin: 0 auto;
}

.slider-container .slide-number {
  position: absolute;
  z-index: 2;
  padding: 4px;
  background-color: rgb(123 123 123 / 75%);
  color: #fff;
  border-radius: 4px;
  font-size: 16px;
  margin: 5px;
}

.slider-container img {
  max-width: 100%;
  position: absolute;
  z-index: 1;
  border-radius: 8px;
  opacity: 0;
  transition: opacity 2s;
}

.slider-container img.active {
  opacity: 1;
}

.slider-controller {
  position: absolute;
  bottom: 22%;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 720px;
}

.slider-controller .indicators ul {
  display: flex;
  list-style: none;
  gap: 20px;
}

.slider-controller .indicators ul li {
  width: 41px;
  height: 41px;
  background-color: #ccc;
  color: #000;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  font-size: 18px;
  cursor: pointer;
}

.slider-controller .indicators ul li.active {
  background-color: #23a1a1;
  color: #fff;
}

.slider-controller .previous-btn,
.slider-controller .next-btn {
  width: 100px;
  padding: 10px;
  background-color: #23a1a1;
  color: #fff;
  text-align: center;
  font-size: 18px;
  border-radius: 6px;
  cursor: pointer;
}

.slider-controller .previous-btn.disabled,
.slider-controller .next-btn.disabled {
  cursor: no-drop;
  background-color: rgba(35, 161, 161, 0.75);
}