modernchairs.io review for Custom Css Pro

I use this app on 3 websites to add custom CSS. I know CSS but I am no where near expert level, and using this app makes me feel more comfortable making edits because I don't have to change any theme files. The changes are instant. The few issues I've had are due to Chrome not clearing the cache. I will be creating more websites and I am sure that will use this app on all of them.