.container {
  width: 800px;
  margin: 0 auto;
}

.slider-wrap {
  overflow: hidden;
}

.slider {
  position: relative;
  left: 0;
  width: 4000px; /* 800px × 5枚 */
  margin: 0;
  padding: 0;
  list-style: none;
}

.slider-item {
  float: left;
  width: 800px;
}
