grootte blockquote instellen in CSS

Noted and that's a start. Further inspection, the Blogger theme has assigned a font size for your posts blockquote, which is why choosing any font size no changes occurs. You can add your custom CSS at Advanced > Add CSS box

.post-body blockquote {

  font-size: 15px!important;

}

click Apply to Blog

Refresh your blog pages and see the changes.

Update highlighted yellow to your preferred font size.

Regards

+irsah


Om centreren van de tekst op te geven toegevoegd: text-align: justify

.post-body blockquote {
  font-size: 16px!important;
  text-align: justify;
 margin-top: 10px;
  margin-bottom: 10px;
  margin-left: 50px;
  padding-left: 15px;
  border-left: 3px solid #ccc;
}