Adds the given CSS className to the HTML <body> element when the condition is true and removes the className on unmount or when the condition is false.
className
<body>
condition
true
false
The CSS class to add to the HTML <body> element.
Indicates whether to add the class or not.
Adds the given CSS
classNameto the HTML<body>element when theconditionistrueand removes theclassNameon unmount or when theconditionisfalse.