"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> </div>v </body> </html>
.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; padding: 16px 32px; text-align: center; }

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