box-shadow: x, y axis offset, blur radius, diffusion radius, color; if multiple shadow rules are used, use commas to separate
linear-gradient: The function is used to create a picture with multiple color gradients. The first attribute can be to left(right) top(bottom) or angle. The angle is calculated from the vertical direction of the Y axis, clockwise
Use css 2D transformation, rotation and translation, to make the effect of smooth glass