Custom CSS Font for Blog Post Titles (On Blog Listing Page)

How do I change the Blog Post Titles on the Blog Listing Page to a custom font?



I tried adding the following in Custom CSS, but it does not work. 

.blog-item-title {
    font-family: gtflexa-black !important;
}

a.blogitem-title {
      font-family: gtflexa-black !important;
}

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