@keyframes scroll{
  0%{ 
    transform: translateX(0);
  }
  100%{
    transform: translateX(calc(-1340px * 7));
  }
}
.element-to-animate {
  animation: scroll 10s ease-in-out infinite;
}

.client_slider{
  height:150px;
  margin: auto;
  position: relative;
  width: auto;
  overflow: hidden;
}
.client_slider .client-track{
  animation: scroll 60s linear infinite;
  display: flex;
  width: calc(550px * 16);
}
.client_slider .slide{
  width: 200px;
  height: 150px;
  padding: 15px;
}