Create gradual color blend using th…
https://helpx.adobe.com/illustrator/using/tool-techniques/gradient-tool.html
Select an object or an area that you want to fill with gradient. Double-click the Gradient tool or press G to open the Gradient panel. Choose a gradient type – Linear, Radial, and Freeform. Select the Gradient tool. Click the Gradient icon (a rectangle with a gray gradient inside) in the toolbar or press G. Select the gradient shape and color.
Select an object or an area that you want to fill with gradient.
Double-click the Gradient tool or press G to open the Gradient panel.
Choose a gradient type – Linear, Radial, and Freeform.
Select the Gradient tool.
Click the Gradient icon (a rectangle with a gray gradient inside) in the toolbar or press G.
Select the gradient shape and color.
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