Use Highlight shortcode to highlight a text. You can add the highlight shortcode, select your desire color, then insert your content between highlight tags. Available options will be explained below:
Red
[aux_highlight style="aux-highlight-red"extra_classes=""]Insert your content here[/aux_highlight]
Blue
[aux_highlight style="aux-highlight-blue"extra_classes=""]Insert your content here[/aux_highlight]
Yellow
[aux_highlight style="aux-highlight-yellow"extra_classes=""]Insert your content here[/aux_highlight]
Green
[aux_highlight style="aux-highlight-green"extra_classes=""]Insert your content here[/aux_highlight]