How to increase the font size of my multicolumn headlines?

[empiricalarby]

https://empiricalwater.com/

Please scroll down to the multicolumn below "Get acquainted with Empirical Water". I need to increase the font sizes for those headlines. How to do this?

Thank you!

[Ahmad032141 · Accepted solution]

There would be a custom css option in the section's setting. Add the following text there:
.multicolumn-list h3{

font-size:24px;
}

You can change the 24 to your liking.