Hiperligações para ter à mão de semear :)

CSS | Cores

http://www.w3schools.com/cssref/css_colors.asp

http://www.w3schools.com/cssref/css_colors_legal.asp

CSS | Transparência <div>

http://www.w3schools.com/css/css_image_transparency.asp

ionic | Componentes

http://ionicframework.com/docs/components/