[Bug report] Hero Image problem with locked width

[YerongAI]

Description

When I set an image for my homepage, the image height was locked to 280.

I don't know what is the height attri from. And I don't have set any extra settings. Just init my project and put a hero image here.

Reproduction

Just use v2.vuepress.vuejs.org/new to open a new project.

Used Package Manager

yarn

System Info

I don't know how to do that, but maybe the info above is enough?

[Mister-Hope]

So why do you think this is a bug?

[YerongAI]

If I have an image with size 140×140, the image will be double enlarge. It should not be resized.