Making changes to CSS included in package

I am using the dmstr/yii2-adminlte-asset package that then includes almasaeed2010/adminlte package.

I need to make some changes to the css of adminlte, however, the css files are located in the @vendor/almasaeed2010/adminlte directory. Of course when I update almasaeed2010/adminlte it will overwrite my changes.

What is the best way to make changes to the css that will not be overwritten? Is there somewhere I can put a small css file to override the existing css, or should I move the adminlte css files and modify them there. If I move them, how would I do it?