5 Answers, 1 is accepted
The blue lines looks like a sprite image which is used in the Classic rendering of the controls.
You can inspect with DevTools the rendered HTML/CSS and hide the sprite or switch to RenderMode="Lightweight" and test again.
If you experience problems provide a live URL or a simple runnable project so that we can debug the issue locally.
I added this to the appSettings
<add key="Telerik.Web.UI.RadButton.RenderMode" value="lightweight" />
But I am still seeing the vertical lines.
Can you set RenderMode="Lightweight" inline for each Telerik control on the page as well as
<add key="Telerik.Web.UI.RenderMode" value="lightweight" />
and send a screenshot once you delete the cache and reload the page?
Have you also tried to inspect the generated HTML/CSS and find the reason for the problem - once you find the css which sets the background you can override it?
We found that another container was the issue. We had to adjust the width and height.
Thank you for your support.