html - How can I centre an object whose height I do not know in a list? -

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it seems no matter can't text black background centre vertically. problem text on 1 line , on 2 or three. i'm trying automatically adjust can't.

i have tried numerous approaches such listed on here.

here code trying centre:

.infogrid {    display: inline-block;    position: relative;    bottom: 45px;    right: 0;    margin: 0px 1% -100% 1%;    width: 98%;    background-color: #f6f6f6;  }  .infogrid ul {    margin: 0;    padding: 0;    text-align: center;  }  .infogrid li {    display: inline-block;    position: relative;    background-color: white;    width: 320px;    margin: 1vw;    height: 320px;    transition: transform 0.4s;    box-shadow: 0.2vh 0vh 0.8vh #888888;  }  .infogrid li:hover {    transform: scale(1.05, 1.05);  }  .tilewrappertext {    display: inline-block;    color: white;    visibility: hidden;    z-index: 1;    width: 100%;    text-align: center;    font-family: "century gothic", "arial", "sans-serif";    background-color: black;    opacity: 0.75;    font-size: 2.2em;  }  #tilewrapper:hover .tilewrappertext {    visibility: visible;  }
<div class="infogrid">    <ul>      <li>        <div id="tilewrapper">          <img id="automargins" src="content/tile1.png" width="96%">          <h3 class="tilewrappertext">half price facials</h3>        </div>      </li>      <li>        <div id="tilewrapper">          <img id="automargins" src="content/tile2.png" width="96%">          <h3 class="tilewrappertext">1/4 off massages</h3>        </div>      </li>      <li>        <div id="tilewrapper">          <img id="automargins" src="content/tile3.png" width="96%">          <h3 class="tilewrappertext">20/3 off hot rocks</h3>        </div>      </li>      <li>        <div id="tilewrapper">          <img id="automargins" src="content/tile4.png" width="96%">          <h3 class="tilewrappertext">20/3 off nails</h3>        </div>      </li>      <li>        <div id="tilewrapper">          <img id="automargins" src="content/tile5.png" width="96%">          <h3 class="tilewrappertext">free use of sauna treatment</h3>        </div>      </li>      <li>        <div id="tilewrapper">          <img id="automargins" src="content/tile6.png" width="96%">          <h3 class="tilewrappertext">free use of jacuzzi treatment</h3>        </div>      </li>      <li>        <div id="tilewrapper">          <img id="automargins" src="content/tile7.png" width="96%">          <h3 class="tilewrappertext">1/20 off eyes</h3>        </div>      </li>      <li>        <div id="tilewrapper">          <img id="automargins" src="content/tile8.png" width="96%">          <h3 class="tilewrappertext">1/20 off hair</h3>        </div>      </li>    </ul>  </div>

the text appears when image hovered over.

since li position relative, can add following css rules h3 center vertically within li.: 

position: absolute; top: 50%; transform: translatey(-50%); margin: 0;

example here: http://codepen.io/nicerhugs/details/dmgmev/

the top move top of h3 halfway down li, , transform correct height of li itself. getting rid of margin take away weird mystery space makes appear lower is.


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