I don't think it's possible. There are tutorials in Community but CSS styling was only possible on Data Center and Server versions of Confluence.
On Confluence Cloud, you are limited to what's available in Confluence settings in the Look and Feel section.
You can change favicon, color of the top bar, header, footer but that's it.
The only option is to use a Theme app such as Scroll Viewport, Spacecraft and others that are available in Marketplace.
Some of them can radically transform your Confluence.
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@Youmna Alomari you might take a look at this link: https://community.atlassian.com/t5/Confluence-questions/How-do-you-configure-default-text-styles-e-g-change-text-color/qaq-p/738739
HTH
Nicolas
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