Yes you can do this. If you take a look around line 1739 in your css file or search for – “#content .portfolio .entry-title” you can add “text-align: center;” and it should center it.
Here is the code –
`#content .portfolio .entry-title {
margin: 12px 0;
padding: 0;
text-align: center;
}`
Let me know if that works.