I have two `div` elements. Second is inside in first element. 
In second I display some text. For second `div` I set height to auto and when I put more text in `div` height is greater. Also I set height for first `div` to auto, but first `div` has always same height. 

How I can set height of `DIV` to be dependable of number of text rows?

```
<div class="first-div">
  <div class="second-div">
  </div>
</div>

.first-div {
    background-color: #f5f5f5;
    margin-top: 5px;
    margin-left: 5px;
    margin-right: 5px;
    border-radius: 6px;
    border: 1px solid #b8b8b8;
    text-align: justify;
    padding: 4px 4px 4px 4px;
    word-wrap: break-word;
    height: auto;
    min-height: 75px;
}
.second-div {
    width: 30%;
    float: right;
    font-size: 9px;
    height: auto;
}

```