I wish to make a few styling changes to the theme myself, but it seems that any editing I do doesn't apply. It's clear the issue lies with me and I'm looking in the wrong places, so I'd like some help with direction. For example, I'd like to give this search bar a curved border with border-radius: 4px; or something similar. I've tried editing css in theme/css/global.css, theme/modules/blocksearch/blocksearch.css, theme/css/modules/blocksearch/blocksearch.css and store/modules/blocksearch/blocksearch.css but it doesn't seem to work. Where should I be looking exactly?