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