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 makes the first paragraph of text match the style of additional paragraphs in Luxury theme.
* 11340446-hc (jw)
*/
.content-holder > p:first-child {
font-family: inherit;
font-size: inherit;
color: inherit;
line-height: inherit;
font-weight: inherit;
}
Tip: keep the /*
comment */
in the code to later know what this code does.