Conditionally override css in Style tag - vue.js

Question

Assuming I am using a plugin that generates html at runtime where I cannot edit the CSS or JS code, leaving me with the only option of overriding certain CSS in particular classes. For instance, in such case I'd often do:
.video-player{
max-height: 500px !important;
}
In case such styling must be handled conditionally based on the props passes to the component, for instance:
<videoPlayer :goSmall="anotherColumn != null"></videoPlayer>
since the CSS in the videoPlayer components must go in the Style tag:
<style scoped>
.video-player{
max-height: 500px !important;
}
</style>
how can I render it conditionally?
It is such a bad idea to append it to the DOM using lifecyle hooks, so please do not suggest anything like that.

Answer 1

Why not apply a specific class to the component instead of passing a prop?
<videoPlayer :class="{ small: anotherColumn != null }"></videoPlayer>
And the css
<style scoped>
.video-player.small {
max-height: 500px !important;
}
</style>

Answer 2

If you are not okay with dynamically applying CSS using lifecycle hooks. You can always box your components. Make two components for your videoPlayer, we'll call them videoPlayerOriginal and videoPlayerSmall.
//videoPlayerOriginal.vue
<videoPlayer></videoPlayer>
Add your css in videoPlayerSmall.vue
//videoPlayerOriginal.vue
<videoPlayer></videoPlayer>
<style scoped>
.video-player{
max-height: 500px !important;
}
</style>
Now render either one of them conditionally.