Autocorrelation Chart showing different colours and no Shadow for checking the Orders to be used for ARIMA

I have been doing a project on Time Series data and one of the items was to test for AutoCorrelation and found the charts in a different color than what I expected. I also don't see the shaded part that allows one to know the values for the order when doing ARIMA

What would have caused this? Is it the data, the code, or anything else? The code is

from statsmodels.graphics.tsaplots import plot_acf
plot_acf(df['Column'])