How can I increase the horizontal spacing in my dropdown menu on 7.1?

Site URL: https://www.irenewei.com/

I found a custom code for vertical spacing, but not one for horizontal spacing on the dropdown menu. I don't know how to code... Can anyone help? Thanks! 

11 hours ago, ilw said:

Site URL: https://www.irenewei.com/

I found a custom code for vertical spacing, but not one for horizontal spacing on the dropdown menu. I don't know how to code... Can anyone help? Thanks! 

You can modify the spacing in the code

body[data-menu-overlay-theme-switcher="true"]:not(.header--menu-open) .header-nav-wrapper a {
    margin-right: 20px;
}