I currently live in a different state than where my employer is, how will state taxes work?

Hi there - I recently moved to MO from CA, but am still employed by a CA employer.   I work from home, but my employer doesn't exactly support their employees working from another state at this time.  I am curious as to how taxes will work?  I am still claiming the address I used to live at in CA, so they are taking out CA taxes.   I know I will have to pay MO taxes as well, so will I be paying 100% of CA state taxes and 100% of MO state taxes?