How to configure customized logo

When I tried to use a customized app logo, the svg displayed abnormal, how could I adjust the style or adjust the image aspectio?

docfx config:

```json
{
"build": {
"globalMetadata": {
"_appName": "dotnet-talks",
"_appTitle": ".NET Talks",
"_appLogoPath": "images/dotnet-logo.svg",
"_appFaviconPath": "images/favicon.ico",
"_enableSearch": true,
"pdf": false
}
}
}
```

The dotnet-logo.svg is as follow:

```xml

```

Start with the shown docfx config and dotnet-logo.svg, then trace how _appLogoPath is consumed in the generated site. Reproduce the abnormal rendering and compare the logo's displayed aspect and styling with the SVG dimensions. Done means a customized SVG logo renders normally in the generated documentation.

Written by the indexing model from the issue text.