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HTML 

              
                <div class="container">
  <div id="windmill">
    <div id="sails">
      <img src="https://www.claraalder.com/assets/img/windmill_sail.png" alt="Roundhill Logo" class="img-sail" />
    </div>
  </div>
</div>
!

CSS 

              
                body {
  background-color: #1D1D1D;
}

.container {
  margin: 40px;
}

#windmill {
  background-image: url("https://www.claraalder.com/assets/img/windmill_building.png");
  background-position: center;
  background-repeat: no-repeat;
  background-size: 350px 350px;
  height: 350px;
  width: 350px;
  margin: auto;
}

.img-sail {
  display: block;
  margin: auto;
  height: 262.5px;
  width: 262.5px;
  padding: 40px;
}

/* 
#sails {
  animation: spin 5s ease-in 3;
} */

/*
@keyframes spin {
  
 100% {
    transform: rotate(360deg);
  }
  
} */
!

JS 

              
                //create a variable that won't be reassigned at any point
//using the gsap to method to spin the sail. it starts paused. its rotation is a constant speed. 
//repeat -1 means infinite
//duration 2 means two seconds
const sails = gsap.to('#sails', {
  rotation: 360,
  duration: 2,
  ease: 'none',
  repeat:-1,
  paused: true,
  // can do stuff like transformOrigin: 'top center' or '50%' or 'center' (short for center center)
  transformOrigin: '50%'
  
  
})

//create a variable that won't be reassigned at any point
const windmill = document.querySelector('#windmill')

//creates a named function that can be referred to elsewhere, which makes the sails move
function playAnimation() {
  sails.play()
}

//creates a named function that can be referred to elsewhere, which makes the sails pause
function pauseAnimation() {
  sails.pause()
}

//adding an event listener to our windmill which listens for a mouse hover and then calls the functions to move the sails
//dom scripting is for webpages - selecting the elements on the webpage
windmill.addEventListener('mouseenter', playAnimation)
//adding an event listener to our windmill which listens for a mouse leaving and then calls the functions to pause the sails
windmill.addEventListener('mouseleave', pauseAnimation)
!
999px

Console