7.1 how to add a button to a portfolio section?

Does anyone know how to add a clickable button to a portfolio page in 7.1? I would like to add a 'view all' button underneath my portfolio hover background links. 

Hi. Yes. Can you share link to portfolio page? WE can help easier

I know i am delayed but did any resolve this?

Here is the portfolio (https://www.lifestyled.media/home) I am hoping to add a button to preferable to look like this: 

24 minutes ago, joshstanley said:

I know i am delayed but did any resolve this?

Here is the portfolio (https://www.lifestyled.media/home) I am hoping to add a button to preferable to look like this: 

Add to Design > Custom CSS

.portfolio-grid-basic .grid-item:after {
    content: "View portfolio";
    border-bottom: 1px solid;
    display: inline-block;
}
.portfolio-grid-basic .grid-item {
    display: inline-block;
}