.container
  .bird
    img(src="https://i.imgur.com/TF6AOdX.png", alt="")
View Compiled 
.container
  width: 400px
  overflow: hidden
  animation: move 5s infinite linear
  
.bird
  margin-top: 80px
  animation: fly 1s infinite steps(4)
  
  
@keyframes move
  0%
    transform: translateX(0px)
  100%
    transform: translateX(1600px)
  
@keyframes fly
  0%
    transform: translateX(0px)
  100%
    transform: translateX(-1600px)
View Compiled

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.