Text over image - responsive

Question

this is my first question soo... i have to do someting like this:

but i search a lot and nothing work for me, i had something like this in my html and css

.thumbnail {
    position: relative;
    margin-bottom: 0;
    border: 0;
    border-color: transparent;
}

.caption {
    position: absolute;
    top: 40%;
    left: 0;
    width: 100%;
}

  <div id="box-search">
      <div class="thumbnail text-center">
          <img src="https://upload.wikimedia.org/wikipedia/commons/thumb/7/7d/Granola03242006.JPG/280px-Granola03242006.JPG" alt="">
          <div class="caption">
              <p>[email protected]</p>
              <p>+56983874071   |   +56228231294</p>
              <p>El Aguilucho 3174, Providencia, Región Metropolitana</p>
          </div>
      </div>
  </div>

that work, but when i use the responsive mode from chrome, the text leave the image

(sorry for my english, i speak spanish)

Answer 1

img {
    display: block;
}

.thumbnail {
    position: relative;
    display: inline-block;
}

.caption {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate( -50%, -50% );
    text-align: center;
    color: white;
    font-weight: bold;
}

<div id="box-search">
      <div class="thumbnail">
          <img src="https://upload.wikimedia.org/wikipedia/commons/thumb/7/7d/Granola03242006.JPG/280px-Granola03242006.JPG" alt="">
          <div class="caption">
              <p>[email protected]</p>
              <p>+56983874071   |   +56228231294</p>
              <p>El Aguilucho 3174, Providencia, Región Metropolitana</p>
          </div>
      </div>
  </div>