encoding and decoding text with special characters (àâäèéêë)

I am trying to encode the text in angular

let encodedText = window.btoa("demoé"); //ZGVtb+k=


when trying to decode the same text in C#, the conversion is not happening properly

string encodedText= "ZGVtb+k=";
byte[] data = Convert.FromBase64String(encodedText);
string decodedString =Encoding.UTF8.GetString(data); //demo�


after decoding I am getting the value as "demo�". Kindly suggest if there is any other approach to handle this scenario.

Thanks in Advance!

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