Select after that the Rectangle Tool (U) and apply it on the whole page. We’ll also set the adjustments in the Blending Options>Gradient Overlay.

 




Select the same parameters indicated below for this layer:



The next picture is what we get now:



Select the option shown below from the lowest layers’ palette:



Choose here the Hue/Saturation option and set the next indicated parameters:



This way we’ll minimize the color’s intensity:



Choose the same option we did earlier: