JSFiddle - React, Tailwind, and code Playground

HTML

<div id="hubs">
     <h3>Nos Hubs</h3>

    <hr> <a class="thumbnail vignette-hub" href="http://kkw.fr">
    <img style="opacity: 0.6;filter: alpha(opacity=60);" alt="AĂ©roport de Nantes" src="http://kkw.fr/uploads/upload-center/nantes-vue-aerienne091501270208.png" width="100%" />
    <p class="txt-hub-image">
      Hub de</br>Nantes
    </p>
  </a>

</div>

CSS

.txt-hub-image {
    z-index: 100;
    position: absolute;
    left: 0px;
    top: 50%;
    width: 100%;
    text-align: center;
    text-decoration: none;
    color: white;
    font-weight: bold;
    font-size: 16px;
    border: 1px solid red;
    margin-top: 0px;
    transform: translateY(-50%);
}
.vignette-hub {
    position: relative;
    width: 25%;
    min-width: 135px;
}
.thumbnail {
    display: block;
    padding: 4px;
    margin-bottom: 20px;
    line-height: 1.42857143;
    background-color: #fff;
    border: 1px solid #ddd;
    border-radius: 4px;
    -webkit-transition: border .2s ease-in-out;
    -o-transition: border .2s ease-in-out;
    transition: border .2s ease-in-out;
}
.thumbnail > img, .thumbnail a > img {
    margin-right: auto;
    margin-left: auto;
}
a.thumbnail:hover, a.thumbnail:focus, a.thumbnail.active {
    border-color: #337ab7;
}
.thumbnail .caption {
    padding: 9px;
    color: #333;
}