Please go to My Site → Customize → CSS (or Additional CSS), then add all of the following code to the bottom of that window.
/* This CSS sets the color and font size on bullet points with the class "bullets-custom-design"
* 11442724-hc (jw)
*/
.bullets-custom-design {
font-size: 16px;
color: #cc0000;
}
Tip: keep the /*
comment */
in the code to later know what this code does.