need sidebar links left-justified

What do we have to change in styles.css to have sidebar-links left-justified. We are using Internet Explorer 9 and they are right-justified.
I don’t know where to do the changes.
web: https://www.krebskranke-kinder-kiel.de

.widget a {
    font-weight: bold;
    text-decoration: none;
    text-align: left;    /* this is the line I added, but there is no                           change */
}