Grrrrrr….how do I resolve this issue?

On this website, PAC Fitness, I have inserted the seperator/blank space shortcode (based on the theme’s shortcode) that allows me to create space between elements. Can you help me to remove the colon that appears when using the shortcode? After attempting to inspect this section of the site, I have been unable to find the CSS code that’s associated. Simply, put the colon is driving me up the wall.