.wrapper {
  width: 850px;
  margin: 0 auto;

}

.slider {
  margin: 10px 0;
  width: 850x; /* Update to your slider width */
  height: 400px; /* Update to your slider height */
  position: relative;
  overflow: hidden;
}

.slider li {
  display: none;
  position: absolute; 
  top: 0; 
  left: 0; 
}