I am unable to hide the Site Title using CSS from my header. Kindly Help

Hello Everyone, This is the URL of my website https://jonesjoshua.com/. I want to hide the title present in top left in black colour ‘Joshua Jones’. However, I don’t want to clear the Site Title Field, just want to hide it using custom CSS. Kindly Help, I tried many codes but none of them worked for me.

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