.slider2 {
  width: 60%;
  margin: auto;
  overflow: hidden;
}

.slider2 ul {
  display: flex;
  padding: 50;
  width: 200%;

  animation: cambio 20s infinite;
}



@keyframes cambio {
  0% {margin-left: 0;}
  20% {margin-left: 0;}

  25% {margin-left: -100%;}
  45% {margin-left: -100%;}


}