Step 1: Go to: Admin CP ---> Templates & Style ---> Click on the name of your theme. (By Default it should be Default or MyBB 1.8)---> Add Stylesheet
File Name: Doesn't matter, just make sure you end it with .css
Attached to: Globally
Then choose: Write my own contentThen write this code:
Code:
.post .post_author div.author_avatar img {
border-radius: 55%;
transition:all 0.3s ease;
}Note - Works is some themes