I'm very new to css and am having difficulty with how to do something - I'm sure it's possible.
I have a lot of images that are slightly different in shape/size. What I'm hoping to be able to do is sit each image on its own box - or contain it within a border. I want the box or border for each image to be the same size for each image to keep it all uniform and displays a lot nicer. I hope that makes sense. If not please fire questions at me because I really want to know how to get this done.
Thanks in advance.

use this code
<img src="your path here" width="55" height="55" style="border: 1px solid #000000;" />

Do you want to do this from a css file?

yes I am doing this from a style sheet

use this

<img src="your path here" width="55" height="55" class="border-img" />

in your stylesheet use this

.border-img{
border: 1px solid #000000;
}

Thanks. I will give it a go and let you know if it worked.