"Efeito Conquista"
Bootstrap 3.0.0 Snippet by GuilhermeCipriano

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<link href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<h2>Opacity with Box</h2>
<p>Hover over the image to see the effect.</p>
<div class="container">
<img src="https://www.w3schools.com/howto/img_avatar.png" alt="Avatar" class="image">
<div class="middle">
<div class="text">John Doe</div>
</div>
</div>
<div class="container">
<img src="https://www.w3schools.com/howto/img_avatar.png" alt="Avatar" class="image">
<div class="middle">
<div class="text">John Doe</div>
</div>
</div>
<div class="container">
<img src="https://www.w3schools.com/howto/img_avatar.png" alt="Avatar" class="image">
<div class="middle">
<div class="text">John Doe</div>
</div>
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.container {
position: relative;
width: 256px;
}
.image {
opacity: 1;
display: block;
width: 256px;
height: 256px;
transition: .5s ease;
backface-visibility: hidden;
}
.middle {
transition: .5s ease;
opacity: 0;
position: absolute;
top: 50%;
left:50%;
transform: translate(-50%, -50%);
-ms-transform: translate(-50%, -50%)
}
.container:hover .image {
opacity: 0.3;
}
.container:hover .middle {
opacity: 1;
}
.text {
background-color: #4CAF50;
color: white;
font-size: 16px;
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