<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>


<div class="contener">
<img alt="Avatar" class="imagen" src="https://2.bp.blogspot.com/
-aOAji33mkzQ/Wwa2LkAtlsI/AAAAAAAAAuc/
64rejCuBO9Y4tKkoO_XgBWwCfHL0SSckQCLcBGAs/
s1600/imag-parahover.jpg">
<div class="overlayer">
<div class="textox">
<p>Texto Hover</p>
</div>
</div>
</div>
<div class="row">
  <div class="col-md-4">
    
  </div>
  <div class="col-md-4">
    <div class="espacio"></div>
  </div>
  <div class="col-md-4"></div>
</div>
.contener{
position: relative;
width: 642px;
height: 428px;
margin-bottom: 10px;
cursor: pointer;
}
.imagen {
display: block;
width: 642px;
height: 428px;
}
.overlayer{
position: absolute;
bottom: 0;
left: 0;
right: 0;
background-color: rgba(0,0,0,0.6);
overflow: hidden;
width: 100%;
height: 0%;
transition: .5s ease;
}
.textox {
font-family: 'Handlee', cursive;
color: #fff;
font-size: 2rem;
white-space: nowrap;
line-height: 0.5rem;
position: absolute;
overflow: hidden;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
-ms-transform: translate(-50%, -50%);
text-align: center;
width: 334px;
border-bottom: 2px solid #fff;
border-top: 2px solid #fff;
height: 3rem;
}

.contener:hover .overlayer {
height: 100%;
}
.col-md-4{border:1px solid #000;}
.espacio{height:30px;}
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External JavaScript

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