Changing block title border globally or custom CSS

Support,

Was wanting to know if NewsPaper has a way to globally change a blocks title border color or do I have to do this individually or with custom CSS.

Here is the block I’m referencing.
https://imgur.com/nWGxbKc

Here is the Custom CSS I can use.
/* Default blue bar under title to green */
.td_block_template_9 .td-block-title:after {
background-color: #88b239 !important;
}

The default background-color seems to be blue , but want it green. I can change each block’s title border individually in the composer or use custom CSS to do it globally. Is their a way to do it globally with the composer?