<https://www.elegantthemes.com/blog/divi-resources/5-text-styling-tricks-for-wordpress-and-divi>

Use the following shortcode with Divi:

[dropcap]yourletter[/dropcap]
Code language: CSS (css)

To change the font etc, you can use the following CSS:

.et-dropcap {
font-size: 95px;
line-height: 0.7;
color: #9ae5d3;
font-family: Times;
padding-top: 10px;
}
Code language: CSS (css)