jquery - Remove CSS atribute from body::after -

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i'm trying remove background-image attribute jquery had no success until now. '::after' don't let me remove-it. how can that?

body::after { background-image: url(../images/16_sm.jpg); }

try this,

html:

<body class='test'>

css:

.test::after{  background-image: url(../images/16_sm.jpg); }

js:

$('body').removeclass('test');

GHI