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JavaScript

Cannot target my first index.

Hey guys, I'm having an issue randomizing a theme on my portfolio website. When you click a button, changeTheme() function is called and should select a random theme from the themeArr array. I see that my math.random function is handing out a random sequence of 0 or 1 and even if i specifically state that I want themeArr[0] to be used, it is using themeArr[1]

const changeTheme = () => {
    let randIndex = Math.floor(Math.random() * 2);
    const themeArr = [
            {
                theme: {
                    bodyBG: body.style.backgroundColor = 'black',
                    fontColor: mainWrapper.style.color = 'white',
                    navBG: mainNav.style.backgroundColor = 'white',
                    navFont: mainNav.style.color = 'black',
                    imageBG: profImg.style.backgroundColor = 'white',
                    buttonColor: themeButton.style.backgroundColor = 'white',
                    buttonFont: themeButton.style.color = 'black'
                }
            },    
            { 
                theme: {
                    bodyBG: body.style.backgroundColor = 'lightgray',
                    fontColor: mainWrapper.style.color = 'brown',
                    navBG: mainNav.style.backgroundColor = 'lightgray',
                    navFont: mainNav.style.color = 'brown',
                    imageBG: profImg.style.backgroundColor = 'lightgray',
                    buttonColor: themeButton.style.backgroundColor = 'lightgray',
                    buttonFont: themeButton.style.color = 'brown'
                }
            }
        ]
    return themeArr[randIndex];
}