@keyframes sliding {
0% { left: 0%; }
20% { left: 0%; }
25% { left: -100%; }
45% { left: -100%; }
50% { left: -200%; }
70% { left: -200%; }
75% { left: -300%; }
95% { left: -300%; }
100% { left: -400%; }
}

#slider { overflow: hidden; height:400px; width:100%; }
#slider>#slider-box>div { width: 20%; float: left; height:400px; }
#slider>#slider-box>.slider-item>.nolink>span>img { width: 100%; height:100%; float: left; object-fit: cover; }
#slider>#slider-box { 
  position: relative;
  width: 500%;
  margin: 0;
  left: 0;
  text-align: left;
  font-size: 0;
  animation: 30s sliding infinite; 
}