#slideshow {
  margin: 20px auto;
  position: relative;
  width: 825px;
  height: 425px;
  padding: 10px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.4);
}

#slideshow > div {
  position: absolute;
  width: 800px;
  height: 400px;
  top: 10px;
  left: 10px;
  right: 10px;
  bottom: 10px;
  
}
.slideshow { 
                width:80%; 
                height:400px; 
            } 
            img { 
                width:100%; 
                height:100%; 
            }