Welcome page slides are not centered

[cezaraugusto]

Bug affects 0.72.x onwards.

Test Plan

1. Navigate through slides
2. Assert slide content is not properly aligned

Jumping content (from @petemill)

1. Open brave://welcome
2. Move to slide 2
3. Observe position of content
4. Hover over 'import' button
5. Observe content jumps to a different position

[bsclifton]

@cezaraugusto can you add a test plan? What versions are affected? I tried this in 0.71.x and can't reproduce

[cezaraugusto]

@bsclifton updated the comment. bug is present only in 0.72.x onwards

[antonok-edm]

Also noticing that it quickly jumps to the intended location when moving the mouse nearby

[LaurenWags]

In addition to @antonok-edm comment in #6846 (comment) sometimes the content jumps to the intended location when interacting with the content via tab (as in #5504 ).

Brave	1.1.2 Chromium: 78.0.3904.97 (Official Build) beta (64-bit)
Revision	021b9028c246d820be17a10e5b393ee90f41375e-refs/branch-heads/3904@{#859}
OS	macOS Version 10.13.6 (Build 17G5019)

[GeetaSarvadnya]

Encountered and reproduced #6846 (comment) on windows 10 x64 - Brave beta1.1.4

[bsclifton]

Marked as release-notes/exclude because I believe the problem isn't on 1.0.x

[btlechowski]

Not in 1.1.18, waiting for another build.

[kjozwiak]

Verification PASSED on macOS 10.15.1 x64 using the following build:

Brave	1.1.19 Chromium: 79.0.3945.70 (Official Build) (64-bit)
Revision	65868db27916cebde51fc2465c9b34761e6383e2-refs/branch-heads/3945@{#869}
OS	macOS Version 10.15.1 (Build 19B88)

• reproduced the original issue using 1.1.18 Chromium: 79.0.3945.56
• went through and verified the original STR as per Welcome page slides are not centered #6846 (comment)
• ensured that the brave://welcome page is aligned on initial launch
• ensured that the brave://welcome page is aligned when navigating through the different pages
• ensured that each page is correctly aligned when interacting with buttons (Import, Set Default etc..)
• ensured alignment looks correct when navigating through each page using both Next & bullets
• ensured that resizing the brave://welcome window doesn't cause any alignment issues
• ensured that all the links are working as expected
• ensured the above STR/cases work as expected when using a secondary monitor

Verification passed on

Brave	1.1.19 Chromium: 79.0.3945.70 (Official Build) (64-bit)
Revision	65868db27916cebde51fc2465c9b34761e6383e2-refs/branch-heads/3945@{#869}
OS	Ubuntu 18.04 LTS

• verified the original STR as per Welcome page slides are not centered #6846 (comment)
• verified all subpages from brave://welcome

Verified passed with

Brave 1.1.19 Chromium: 79.0.3945.70 (Official Build) (64-bit)
Revision 65868db27916cebde51fc2465c9b34761e6383e2-refs/branch-heads/3945@{#869}
OS Windows 10 OS Version 1809 (Build 17763.864)

• reproduced the original issue using 1.1.18 Chromium: 79.0.3945.56
• went through and verified the original STR as per Welcome page slides are not centered #6846 (comment)
• ensured that the brave://welcome page is aligned on initial launch
• ensured that the brave://welcome page is aligned when navigating through the different pages
• ensured that each page is correctly aligned when interacting with buttons (Import, Set Default etc..)
• ensured alignment looks correct when navigating through each page using both Next & bullets
• ensured that resizing the brave://welcome window doesn't cause any alignment issues
• ensured that all the links are working as expected