Allow customization of width and height

[j-f-r]

Is your feature request related to a problem? Please describe.
I'm attempting to use this in conjunction with a v-textarea to achieve something similar to Whatsapp's emoji+input behavior.
Right now, the fact that this component's dimensions are static prevents me from tinkering with it for this use-case.

Describe the solution you'd like
I'd like to be able to customize this component's dimension to fit over or under a textarea.

There are some similar libraries that try to achieve this (https://github.com/kevinfaguiar/vue-twemoji-picker - comes to mind), however, it has its own downsides and is less customizable.

Describe alternatives you've considered
I've considered using other libraries such as this.