Need help with custom toolbar icons.
I did a search but couldn't find anything helpful. I close to finishing my first theme but kinda of struggling with one problem. See, I'm not creating any custom toolbar icons for the first release. So, when I add a new button to the toolbar it shows the text without the button background. Check the attached picture, I want the background to be displayed for the last button (Insert new). Please let me know how to fix it.
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