Hi
You also have to change description and heading margin left
try this code:
.dcms_author-info .dcms_author-description,
.dcms_author-info .dcms_author-heading{
margin-left: 136px!important;;
}
If you want to use another gravatar size, find this file: /wp-content/plugins/simple-author-bio/includes/class-dcms-simple-author-bio.php
Search get_avatar function (line 132), and add another parameter, default is 96
For example:
$replace[] = get_avatar( get_the_author_meta( 'user_email' ), 512 );
Ref: https://codex.www.ads-software.com/Function_Reference/get_avatar
Cheers! ??