fix: use textContent instead of innerHTML for style injection to avoid CSP violations

* set textContent instead of innerHTML for CSS injection

Set node.innerHTML will trigger a `This document requires 'TrustedHTML' assignment` error in chrome, because of CSP protection

Signed-off-by: 九条涼果 <enihsyou@gmail.com>

* Change innerHTML to textContent for style elements

Signed-off-by: 九条涼果 <enihsyou@gmail.com>

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Signed-off-by: 九条涼果 <enihsyou@gmail.com>