Changing the font in a text box thats not any of the formatted fonts

Site URL: https://antelope-ferret-s6wp.squarespace.com/

Hello,

im trying to alter the font in just one part of the site. Brine gives me H1, H2 and H3 but I would like to just modify one subheading - is there a code for this and if so where do I apply it? thanks for any help in advance

password: sashes&covers

Which text? 

the 'Designing luxury table se.... ' (dark blue colour)

Add to Home > Design > Custom CSS

/* design luxury text */
div#block-24d98077c916caf445a0 h2 {
    color: red;
    font-family: monospace;
}

thanks!!