I'd like to make the number that tells you how many posts there are in a forum a smaller font size

 

How can I achieve this please?

 

In the CSS is my guess:

 

.ipsDataItem_statsLarge .ipsDataItem_stats_number {
    font-size: 22px;
    font-weight: 300;
    line-height: 1.3;
}

Change "font-size: 22px;" to whatever number you want.

Thanks, I added it to custom.css

AdminCP->Customization->Themes->Edit HTML and CSS (of theme you are using)->CSS->Core->Front->Custom->custom.css

Paste this at the bottom of the file:

.ipsDataItem_statsLarge .ipsDataItem_stats_number {
    font-size: 22px;
    font-weight: 300;
    line-height: 1.3;
}

Change the font-size to your desired number.