How to fix position: absolute in firefox?

Question

css

Firefox :

Google Chrome :

html :
<span>Нояб 18, 2015</span>
css :

div.news-and-events div.default-news div.news span {
    position: absolute;
    margin-top: -51px;
    color: #fff;
    background: rgba(18, 23, 15, 0.69);
    padding: 8px 19px 10px 9px;
}

How to fix in firefox?

Answer 1

Set the relative to the parent. And the absolute positioning is still through the left, top.