Changing blog title font CSS

Site URL: https://tulip-shallot-l5l7.squarespace.com/newsletters/episode-06-staycationing-layrn

I can't work out how to target the blog title font and change it , I've managed to target every other element but cant get this to change , please help!

For example on this page where it says 'May' at the top of the page

https://tulip-shallot-l5l7.squarespace.com/newsletters/episode-06-staycationing-layrn

Password: f7 

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code below does not work 

.summary-title a {
    font-family: fantasy;
}

Try this:

.blog-item-title h1 {
    font-family: Helvetica !important;
}