#outer-container {
    display: flex;
    justify-content: center;
    align-items: center;
}


#container {
    position: relative;
    width: 960px;
    height: 320px;
}

#container1 {
    position: relative;
    width: 960px;
}

#image1 {
    position: absolute;
    width: 100%;
    height: 100%;
}

#image2 {
    position: absolute;
    width: 100%;
    height: 100%;
    clip: rect(0, 350px, 320px, 0);
}

#slider {
    position: absolute;
    top: 0;
    left: 350px;
    width: 5px;
    height: 100%;
    background: #ffffff;
    cursor: ew-resize;
    z-index: 1;
}

#slider .arrow-left {
  position: absolute;
  top: 50%;
  left: -20px;
  transform: translateY(-50%);
  font-size: 20px;
  color: #ffffff;
  z-index: 2;
}

#slider .arrow-right {
  position: absolute;
  top: 50%;
  right: -20px;
  transform: translateY(-50%);
  font-size: 20px;
  color: #ffffff;
  z-index: 2;
}

.video-container {
    display: flex;
}

.video-container video {
    width: 50%;
}