To make YouTrack a bit more bearable:

.color-fields__plain-color-,
.yt-dark-grey-text
{
    color: black !important
}

:root
{
    --yt-app-fsi-max-width: 1800px;
    --yt-primary-font-size: 16px;
    --yt-secondary-font-size: 14px;
}

.yt-issue-title
{
    font-weight: bold;
}

*
{
    font-family: 'Arial';
}