The buttons must be represented with this tool . The first layer includes an outlined circle with the gradient.

The contours’ color is the same with the gradient’s one, the darkest place is colored in 1D66FF.
The second layer is composed of an ellipse with the gradient and Fill – 0%.

Copy now the made button on each menu’s opening, but you should change the colors of the gradient and the contours.

Fill the site with the text now.

The buttons’ text has next adjustments, inserted in the table.

The text inside the header has the next demands.