Size of HTML editing area? Border around search text area?

In the theme I’m using – Blocksy – there are various widgets available. I’m using two: Block, and Search. I have two questions:

1. For Block (in the customizer), you get a box for entering HTML. The box is on the left, and is pretty narrow. How can I enlarge the box so that I can better edit its contents?
2. The Search widget is pretty straightforward. But I’d like to be able to make the search text box stand out a bit more, with a stronger border. Can I do this by adding a CSS style somewhere? And if so, what variable should I be setting?

Many thanks!


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