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electron - i can't change css in iframe but run in console.log It works

i want to change bgcolor of mainHeader and sidebar

this code work in console.log but not work in javascript function

iframe.contentWindow.document.getElementsByClassName('MainHeader jsx-1834506763')[0].style.backgroundColor = data
question from:https://stackoverflow.com/questions/65880226/i-cant-change-css-in-iframe-but-run-in-console-log-it-works

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