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hover on image with overlay slide in effect but without any revese effect

<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
.container {
  position: relative;
  width: 50%;
}

.image {
  display: block;
  width: 100%;
  height: auto;
}

.overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: #008CBA;
  overflow: hidden;
  width: 100%;
  height: 0;
  transition: .5s ease;
}

.container:hover .overlay {
  height: 100%;
}

.text {
  color: white;
  font-size: 20px;
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  text-align: center;
}
</style>
</head>
<body>

<h2>Slide in Overlay from the Bottom</h2>
<p>Hover over the image to see the effect.</p>

<div class="container">
  <img src="img_avatar.png" alt="Avatar" class="image">
  <div class="overlay">
    <div class="text">Hello World</div>
  </div>
</div>

</body>
</html>

as above code when we hover over the image it gets overlay effect but on mouse leave, I don't want this reverse effect. when mouse leave happens I just want to hide overlay and show the image as at starting.how can I achieve this. I have tried using javascript but nothing worked for me.help me.

ref code: link

Move the transition to the hover state

 .container { position: relative; width: 50%; }.image { display: block; width: 100%; height: auto; }.overlay { position: absolute; bottom: 0; left: 0; right: 0; background-color: #008CBA; overflow: hidden; width: 100%; height: 0; }.container:hover.overlay { height: 100%; transition: .5s ease; /* here */ }.text { color: white; font-size: 20px; position: absolute; top: 50%; left: 50%; -webkit-transform: translate(-50%, -50%); -ms-transform: translate(-50%, -50%); transform: translate(-50%, -50%); text-align: center; }
 <h2>Slide in Overlay from the Bottom</h2> <p>Hover over the image to see the effect.</p> <div class="container"> <img src="http://www.fillmurray.com/460/300" alt="Avatar" class="image"> <div class="overlay"> <div class="text">Hello World</div> </div> </div>

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