Custom CCS Font Updated to Site Except for Blog (Version 7.1)

Site URL: https://sarahhinch.com/journal

I have updated h1, h2, h3, and h4 fonts to ALTA font on all pages with custom CCS, but the blog headings did not change (both blog titles and within each blog). Is there custom ccs that can change the rest of the headings?

Use this CSS

h1, h2, h3, h4 {
    font-family: Alta !important;
}