Reversing a css animation -

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i have overlay fades in following code,

.overlay {     background: rgba(32, 79, 156, 0.97);     width: 100%;     height: 100vh;     position: fixed;     z-index: 1000;    display: none;   }  .overlay.active {     display: block;      -webkit-animation-duration: 0.5s;     -webkit-animation-name: fadein;      animation-duration: 0.5s;     animation-name: fadein; }      @keyframes fadein {     0% {         display:none;          opacity: 0;     }      1% {         display: block ;          opacity: 0;     }      100% {         display: block ;          opacity: 1;     } }

all js toggle class 

$('.hamburger').on('click', function(){        $('.overlay, .hamburger').toggleclass('active');     });

how can reverse animation? @ moment jumps previous state.

animations won't work on display property display:none hides element wouldn't see fade if animation running. can animate opacity property using css transitions this:

$('.hamburger').on('click', function(){         $('.overlay, .hamburger').toggleclass('active');      });
.overlay {      background: rgba(32, 79, 156, 0.97);      width: 100%;      height: 100vh;      position: fixed;      z-index: 1000;      opacity:0;      pointer-events:none;      -webkit-transition: scale, opacity 0.5s ease;      -moz-transition: scale, opacity 0.5s ease;      -o-transition: scale, opacity 0.5s ease;      transition: scale, opacity 0.5s ease;  }    .overlay.active {      opacity:1;      pointer-events:auto;  }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <div class="hamburger">hamburger</div>  <div class="overlay">overlay</div>


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