Hi Sharon,
I have tried the code in the console while on your blog page and it’s working fine.
Try updating it to:
.x-iso-container-posts.cols-2 .entry-title a {
font-size: 100% !important;
}
Or setting the font size value to a px value.
If that still does not work, there might be some CSS error in the codes you have added in your global css which is causing the code not to take effect. To verify that, please copy all the codes that are in the Global CSS and paste it here.
It should provide some information if there are any CSS error that is causing the issue that you have to fix so that the CSS codes will work.
Hope this helps.