firefox adds strange space arround Pseudo-elements

Question

Take a look at these photos
JSFiddle link at the bottom

firefox:

Answer 1

I'd recommend you to specify top:0; left: 0; to your ::before pseudo elements. Sometimes cheeky browsers take a few px up and left to the actual position. CSS:

.like:before {
    float: none;
    width: 30px;
    content: "like";
    margin: 0px 10px 0px 0px;
    padding: 0px 5px;
    background-color: #FF7373;
    color: #FFF;
    border-right: 1px solid #CCC;
    position: absolute;
    top: 0;
    left: 0;
    border-radius: 4px 0 0 4px;
}
.like {
    float: none;
    height: 30px;
    border-radius: 4px;
    box-shadow: 0px 0px 1px rgba(0, 0, 0, 0.5);
    padding: 0px 10px 0px 0px;
    margin: 12.5px 10px;
    background-color: #000;
    font: 16px/30px arial;
    color: #FFF;
    border: medium none;
    position: relative;
    width: 88px;
    text-align: right;
}

Fiddle: http://jsfiddle.net/79cEb/13/