Untitled

<div class="boc">

  <div id="boc">ТЕКСТ</div>

</div>

.boc {

  width: 680px;

  height: 240px;

  background: url(http://worldoftanks.ru/dcont/fb/image/t34_243_2.jpg);

  border: 2px solid;

  position: relative;

}

#boc {

  width: 100%;

  height: 50px;

  margin: 0 auto;

  background: red;

  position: absolute;

  top: 50%;

  margin-top: -25px;

}