You will first need to know how to assign a class to each scrollbox.
Setting up individual classes:
If you want to add more than one scroll box you will need to name each individual class name.
EX: <div class="scrollbox1"> is one box. <div class="scrollbox2"> is another box, and so on...
Click here for the individual scroll box code.
Now that you know how to set up your scrollbox classes
Insert this code in your CSS box to create all images the same size.
Adjust the height and width to your likings but all dimensions should be the same if you want all images to be the same size.