You can follow these steps to make one work in Blog Post title italic style.
#1. First, edit the blog post and wrap word in <em> tag
#2. Use this code to Code Injection > Footer
#3. Result
#4. If you want to change this word to a different color, you can use this extra code to Custom CSS.
div.blog-item-title h1 em, h1.blog-title a em, a.summary-title-link em { color: #f1f; }
#5. Note:
<em> tag will appear in browser address bar
You can hover on Blog Post > Click Settings
and set new Blog Title to remove <em>