* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: sans-serif;
}

:root {
  --transition-speed: 0.6s;
  --btn-bg-color: rgba(0, 0, 0, 0.4);
}

body {
  height: 100vh;
  overflow: hidden;
}

.img-container {
  position: relative;
  width: 100%;
  height: 100vh;
  overflow: hidden;
}

.img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  opacity: 0;
  transition: opacity var(--transition-speed) ease-in-out;
}

.img.active {
  opacity: 1;
}

/* Arrow buttons */
.arrow-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  border: none;
  background: var(--btn-bg-color);
  cursor: pointer;
  z-index: 2;
  padding: 12px 18px;
  border-radius: 50%;
}

.arrow-btn p {
  font-size: 2rem;
  color: white;
  margin: 0;
}

.arrow-btn:hover {
  background: rgba(0, 0, 0, 0.6);
}

.left-arrow {
  left: 50px;
}

.right-arrow {
  right: 50px;
}