How to set element height for a fixed number of lines of text

You can use the webkit property line-clamp

.container {
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;  
}

It doesn't work on all browsers, but hopefully it will one day.

Use rem:

.container {
    height: 3rem; /* 1rem for each visible line */
    overflow: hidden;
}

If you are going to use this you should ensure the line-height is always 2.5ex

.container {
  line-height: 2.5ex;
  height: 7.5ex; /* 2.5ex for each visible line */
  overflow: hidden;
}

Demo

you can set the line height of a text and with it knows the exact height of each row and set desired height of your container, simply doing this:

.container {
    line-height:25px;
    height:75px;
    overflow:hidden;
}

Now everything works rightly :)

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