How to center filter_button?

I would like to centre the filter button in Academic Theme

But I am not sure how to do it. thanks a lot for your help

I figured out what I need, but I am not sure where to put it

.btn-toolbar {
    text-align: center;
    align-content: center;
    /* display: flex; */
    flex-wrap: wrap;
    justify-content: flex-start;

Here is the documentation on how to add custom CSS to your theme (Academic is Wowchemy now):

yes, thank you. I was following that example.
somehow my custom css is not working.
the following one worked:

.btn-toolbar {
    justify-content: center;

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