Picture is not in the middle on blog page

I have set the picture in the middle on blog edit page, but it can not be in the middle when I preview it on the blog page.
I also added the following CSS on the global Global Custom CSS:
.wp-block-image figcaption {

text-align: center;

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Hello,

Please use the below custom CSS code and paste it to Theme Settings >> Custom CSS >> Global CSS section:

.wp-block-image figure.aligncenter.size-full {
    text-align: center;
}

Best Regards

[Author]

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