Extra white pixel when Anti-aliasing is selected and try to export image
Simply right click in the shape that has the extra white pixel and select “object hinting”
When you export, the shape will align itself to the closest pixel and the white pixel will disappear.
See this article.
Finding the hexadecimal color value
Select an object for interrogation.
In the right of the status bar is a box showing your current fill. Double click it. The Uniform Fill box will appear. Click the Palettes Tab. click the pull down for the Pallete and select WEB SAFE COLORS.
The Hex numbers will appear in the lower right of the dialog under NAME