.simple-banner {
  position: relative;
  width: 100%;
  max-width: 1200px;
  height: 420px;
  margin: 20px auto;
  overflow: hidden;
  border-radius: 14px;
  background: #eee;
}

.banner-slide {
  width: 100%;
  height: 100%;
}

.banner-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.45);
  color: white;
  font-size: 22px;
  cursor: pointer;
  z-index: 2;
}

.nav-btn:hover {
  background: rgba(0, 0, 0, 0.7);
}

.prev {
  left: 15px;
}

.next {
  right: 15px;
}