CSS won't change link's size

HTML-CSS
1

Code All link’s were given the class but they won’t change size. Help pls.

2

The code below:

.biglink a {
    /* some css */
}

Will select a tags that have a parent element with the biglink class. Perhaps what you are looking for is:

a.biglink {
    /* some css */
}

which selects a tags that also have the class biglink applied to them.