This appears to be the page online:
The border is being applied by this in the embedded style sheet:
border: 4px solid black;
If you need to apply one-off styling either to a single element or similar elements that may occur throughout your site (such as flag images) then you could create a new class with an appropriate name e.g.
And add the class to the img element:
<img class="flag-pic" src="images/UKflag.gif" width="200" Height="100">
Alternatively, if it's likely that borders will need to be overridden on a range of different elements, you could use a class name that reflects this single purpose e.g. .no-border