widget title – font size

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Hi there

I am using Astra theme and as you can see in the link, on the right side the word “Categories” is too big.

Astra does have an option to customize and resize it but it simply does not work.

Can this be fixed with using CSS ?

I tried this code below but it did not work:

.Categories .widget-title {
font-size: 10px;
font-weight: 600;
}

update:

this is the correct code:

.widget-title {
font-size: 20px !important;
font-weight: 600;
}

The page I need help with: [log in to see the link]