style.css

.slider {
  position: relative;
  width: 640px;
  height: 426px;
  overflow: hidden;
}

.slider > ul {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.slider > ul > li {
  position: relative;
  float: left;
}

.slider-text {
  position: absolute;
  z-index: 1;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 15px;
  background: rgba(0, 0, 0, .3);
  color: #fff;
  text-align: center;
}

.slider > .prev,
.slider > .next {
  position: absolute;
  z-index: 2;
  width: 50%;
  height: 100%;
  cursor: pointer;
}

.slider > .prev {
  left: 0;
}

.slider > .next {
  right: 0;
}