The CSS class .agl-hover is a hover effect that applies styles when the mouse hovers over an element。 The purpose of this class is to provide visual feedback when hovering over an element, change the appearance of the element (such as color, background color), and indicate that elements can be interacted with (e.g. links, buttons) 。 The class .agl-highlight-current and .agl-highlight-similar are used to highlight current and similar items respectively。 The class .agl-highlight-group is used to highlight groups of items。