GitHub user dosubot[bot] added a comment to the discussion: bug(ui): Main logo 
resizes abnormally after replacing/loading custom SVG

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Thanks for confirming — 1200×235 is a ~5.1:1 aspect ratio (very wide, short), 
which is not inherently a problem. Here's what's happening in the code and what 
to try:

The navbar renders your logo inside a `Typography.Link` with 
`className="navbar-brand"`. When `theme.brandLogoUrl` is set, the wrapper gets 
an inline style with `height: theme.brandLogoHeight` (and `minHeight: '0px'`), 
but **no explicit width** on the `<img>` 
[[1]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/src/features/home/Menu.tsx#L267-L289).
 The `.navbar-brand` CSS rule provides `max-width: ${theme.sizeUnit * 
theme.brandIconMaxWidth}px` and `img { height: 100%; object-fit: contain; }` 
[[2]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/src/features/home/Menu.tsx#L60-L74),
 which *should* constrain and aspect-preserve your logo correctly.

With `sizeUnit: 4` and `brandIconMaxWidth: 37`, the container caps at `148px` 
wide. Your logo scaled to 24px tall at a 5.1:1 ratio would be ~122px wide — 
well within that cap. So it **should** render fine if those theme tokens are 
present.

The distortion you're seeing is most likely because one or more of those tokens 
(`brandIconMaxWidth`, `sizeUnit`, etc.) are missing due to a partial 
`THEME_DEFAULT` override replacing the entire dict instead of merging. This 
matches a bug that was fixed via deep-merging partial overrides with built-in 
defaults [[3]](https://github.com/apache/superset/pull/41347).

**What to try:**

1. **Apply the full explicit `THEME_DEFAULT`** I gave earlier (all brand 
tokens, not just two) — a dropped `brandIconMaxWidth` from the partial-override 
issue is the most likely cause.
2. **If still distorted**, check if there's excess whitespace/padding baked 
into the PNG itself. Even though the file is 1200×235, if the actual logo art 
only occupies a portion of that canvas, the *visual* result can look off when 
scaled down. Trimming the PNG to just the logo content can help.
3. **Sanity check:** open `/static/assets/images/turksat.png` directly in your 
browser to confirm the file itself isn't corrupted or mis-encoded.

Could you share a screenshot of how it renders with the fully explicit 
`THEME_DEFAULT` applied? That'll clarify whether this is the partial-override 
issue or something specific to how this PNG scales.


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GitHub link: 
https://github.com/apache/superset/discussions/43726#discussioncomment-18221609

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