### Steps to reproduce

1. Login as an admin on Nextcloud

2. Go to the OpenProject settings https://nextcloud.test/settings/admin/openproject

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### What is the buggy behavior?

Begin of the insertion1. End of the insertion The green headlines and red button are too light Begin of the insertion


End of the insertion Begin of the deletion

End of the deletion <figure class="image op-uc-figure"><div class="op-uc-figure--content"><img class="op-uc-image" src="/api/v3/attachments/793015/content"></div></figure> Begin of the insertion

&nbsp; 2. Additionally the work package search term is hard to read when the focus on the input is lost

<img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/793534/content">

<br>End of the insertion

### What is the expected behavior?

1. Texts are readable when in color


Looks like the css variables changed. Now there is `color-success-text`

<img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/793016/content">

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### Environment information

_Please check and fill out the following details to help us identify in what versions and distributions of OpenProject the error occurs_

**OpenProject installation type**

* Hosted cloud edition

* Packaged installation

* What distribution?

* Docker All-in-one container

* Docker-compose installation

* Other (please specify)


**OpenProject version**

_If you&#39;re not running on the cloud edition, please specify the version of OpenProject you&#39;re running. Example: v12.1.5_

**Browser**

* [x] Chrome
* [ ] Firefox
* [ ] Safari
* [ ] Mobile Safari
* [ ] Other (please specify)

**Operating System**

* [ ] Windows
* [x] Mac OS X
* [ ] Mobile iOS
* [ ] Mobile Android
* [ ] Linux (please specify distro)
* [ ] Chrome OS
* [ ] Other (please specify)

**Language**

_Please specify the browser language and the language of the OpenProject user for which the bug occurred._