need to change the size of footer widget title

Hi,

1. If you want to change the font-size and font-family of footer widget title, you can add the following code to the style.css file:

   #sidebar-footer .widget-title {
   font-family: "NovecentowideBookBold", Georgia, "Times New Roman", Times, serif;
   }
   .widget-title {
   font-size: 11px;
   }

2. To change the size of author avatar in the left hand side of single post, you can use the following code:

   .single .site-content>.hentry .entry-action .co-author img {
   width: ...px; 
   }

   Hope this helps !