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I would like to know how I do to keep the chat centered.
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Welcome to SO Adriana, please do a [tour] to get to know the tool better, this way you will be able to create concise questions so that we can help you.
– RFL
Thanks for your help.
– Adriana Medalha Perez
Possible duplicate of How best to center an element vertically and horizontally?
– William Aparecido Brandino