.sliding_head_container{
  display: inline;
  display: flex;
}

.slide_head_big{
  width: 160px;
  height: 160px;
  animation-name: big_head_annimation;
  animation-duration: 2s;
}
@keyframes big_head_annimation{
  from {width : 80px;}
  to {width : 160px;}
}

.slide_head_medium{
  width: 130px;
  height: 130px;
  animation-name: medium_head_annimation;
  animation-duration: 2s;
}
@keyframes medium_head_annimation {
  from {width : 50px;}
  to {width : 130px;}
}

.slide_head_small{
  width: 80px;
  height: 80px;
  animation-name: small_head_annimation;
  animation-duration: 2s;
}
@keyframes small_head_annimation {
  from {width : 40px;}
  to {width : 80px;}
}