Need to define the minimum width and margin for the Rewards pages for the desktop

[jenn-rhim]

Description

Feature components of Brave Rewards-- Ads, Contributions, Tips module, are responsive indefinitely that the content display gets broken below a certain window size.

Please define the minimum width to 1024, which will preserve the content as well as keeping the margins for the page.

Steps to Reproduce

Actual result:

Expected result:

Reproduces how often:

Brave version (chrome://version info)

Reproducible on current release:

• Does it reproduce on brave-browser dev/beta builds?
• Does it reproduce on browser-laptop?

Website problems only:

• Does the issue resolve itself when disabling Brave Shields?
• Is the issue reproducible on the latest version of Chrome?

Additional Information

[GeetaSarvadnya]

Verification Passed on

Brave	0.57.3 Chromium: 70.0.3538.67 (Official Build) dev (64-bit)
Revision	9ab0cfab84ded083718d3a4ff830726efd38869f-refs/branch-heads/3538@{#1002}
OS	Windows

Verified passed with

Brave	0.56.7 Chromium: 70.0.3538.77 (Official Build) beta(64-bit)
Revision	0f6ce0b0cd63a12cb4eccea3637b1bc9a29148d9-refs/branch-heads/3538@{#1039}
OS	Mac OS X

Verification passed on

Brave	0.56.7 Chromium: 70.0.3538.77 (Official Build) beta(64-bit)
Revision	0f6ce0b0cd63a12cb4eccea3637b1bc9a29148d9-refs/branch-heads/3538@{#1039}
OS	Linux