Анатолий

.main-btn:after {
  content: "";
  margin-left: 60px;
  width: 30px;
  height: 300px;
  background: #fff;
  -webkit-animation-delay: 0.05s;
  animation-delay: 0.05s;
  position: absolute;
  left: -40px;
  top: -150px;
  -webkit-animation-timing-function: ease-in-out;
  animation-timing-function: ease-in-out;
  -webkit-transition: all 0.1s;
  transition: all 0.1s;
  -webkit-animation-name: slideme;
  animation-name: slideme;
  -webkit-animation-duration: 3s;
  animation-duration: 3s;
  -webkit-animation-iteration-count: infinite;
  animation-iteration-count: infinite;
  -webkit-transform: rotate(45deg);
  transform: rotate(45deg);
}
@-webkit-keyframes slideme { 0% { left: -30px; margin-left: 0px; }
  30% { left: 110%; margin-left: 80px; }
  100% { left: 110%; margin-left: 80px; } }