To add a number before Product Title, like this.
You can use this code to Custom CSS box.
div.grid-item {
counter-increment: portfolio;
content: counter(li);
position: relative;
overflow: hidden;
}
div.grid-title:before {
content: '0' counter(portfolio) '.';
display: inline-block;
color: #000;
padding-right: 5px;
}
To change number color, edit this line.