Modify the style of HTML body in JS

body, html {
   width: 300px;
   height: 300px;
}

// Get the body and html node styles (mainly html here, it is not clear how to get it at first)
let bodyStyle = document.body.style
let htmlStyle = document.getElementsByTagName('html')[0].style

// Get the width of the browser. Width can also be set to any value. let width = document.documentElement.clientWidth || document.body.clientWidth

// Reset body width bodyStyle.width = `${width}px`

// Reset html width htmlStyle.width = `${width}px`

// Or other style modifications, such as:
htmlStyle['min-width'] = `${width}px`