Removes auto center from theme - v4.2.8

[stevenwanderski]

Previously when using the theme file, all sliders would be auto-centered because of the style: margin: 0 auto 60px. This is no longer desirable since auto-centered should not be the default. If centered is still wanted, include the following in a custom CSS file:

.bx-wrapper {
  margin-left: auto;
  margin-right: auto;
}