How to use math.log10 function on whole pandas dataframe

I want to take the logarithm of every value in a pandas dataframe. I have tried this but it does not work:

#Reading data from excel and rounding values on 2 decimal places
import math
import pandas as pd

data = pd.read_excel("DataSet.xls").round(2)
log_data= math.log10(data)

It gives me this error:

TypeError: must be real number, not DataFrame

Do you have any idea what to do?

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