transition, pseudoslider

by Alexander Zonov

HTML

<div class="container">
    <div class="part part--position_left"></div>
    <div class="part part--position_right"></div>
</div>

CSS

.container {
  
}

.part {
  margin: 0 auto;
  position: absolute;
  top: 0;
  left: 50%;
  opacity: 0;
  transition: transform 1s ease-in, opacity 1s ease-in;
}

.part--position_left {
  margin-left: -200px;
  width: 400px;
  height: 300px;
  background-color: green;
}

.part--position_right {
  margin-left: -100px;
  width: 200px;
  height: 400px;
  background-color: red; 
  transform: translateX(-10px);
}

.part--position_right.part--animation_in {
  opacity: 1;
  transform: translateX(0);
}

.part--position_right.part--animation_out {
  
}