Fix Tile component

[blenderskool]

I'm submitting a ...

• [ ] bug report
• [X] feature request

Current behavior:

As of now, the Tile component is missing a few styles that are shown in the guidelines. Following styles are missing:

• Correct Box-shadow
• Gradient Background

Expected behavior:

Tile component follows the design guidelines

[saini-himanshu]

Gradient Background can be done by using two colors, passing one color by backgroundColor as prop then selecting the other light shade of same color in styles.

[blenderskool]

@saini-himanshu I am working on this. We have to darken the color and use it as a gradient. Here's some reference https://stackoverflow.com/questions/5560248/programmatically-lighten-or-darken-a-hex-color-or-rgb-and-blend-colors

[blenderskool]

@saini-himanshu Here's how it looks after the fixes.