Blurry icons when bigger than the usual Atlassian Format in the Jira SD Portal

[Sveta2579]

Dear all,

In order to customize the view of the Jira SD Portal the Refined Theme for Jira SD as an Add-on was used and customized pictures added, which were made bigger. And the issue is that when the icons are bigger than the usual Format in Jira SD they get blurry. Is there possibility to avoid that or to mitigate that effect? Thank you in advance! Kind regards Radosveta