Use more !important on details to avoid conflict with bootstrap_styles

Problem/Motivation

Hello, I encountered an issue using gin_lb and bootstrap_styles at the same time especially on details.
The styles are colliding and apply part from gin_lb and bootstrap_styles. Using !important on the CSS rules of gin_lb fixes almost all the problem.

Before:

After patch:

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes