Hello,
you have to use CSS in order to do that.
For the title, you need to overload the properties of the class .newstitle.
You need to add something like this to your template:
.newstitle {
font-size: 12px !important;
color: #000000;
}

I was talking about your website's template.
Good practice would be to add or modify the CSS properties of any of your extensions at the template level, so that when updating extensions, it does not override your modifications.
Do not modify style.css.php, add the previous suggestions to a separate file in your template's CSS directory, and call that file from your template, in index.php.

I would suggest you look at the Joomla!'s website to find information on how to modify a template.
I do not know which template you are using, but you will find the index.php file under your Joomla!'s root directory /templates/your_template_name_here.
In there, there will be calls to CSS files. Just add your own in it, the same way it is already done.