Fix for cut off "X" close img, if using lightbox with bootstrap.

[chasegiunta]

If using bootstrap, a global box-sizing attribute causes a small issue with the close image button, using the default nivo lightbox theme.

[Eccenux]

Good point, but you are using too broad selector with unnecessarily important directive. Only .nivo-lightbox-theme-default .nivo-lightbox-close can actually be affected by box sizing effects and it's the only one that should be changed to avoid future problems.

So this should be enough:

.nivo-lightbox-theme-default .nivo-lightbox-close {
...other properties...
box-sizing: content-box;
-moz-box-sizing: content-box;
-ms-box-sizing: content-box;
-webkit-box-sizing: content-box;
}