Error on compiling sass or mapingurl.

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I don't know this problem ralated to laragon or laravel. So when i try compile my assets (sass and js) use laravel mix everything work fine. But when i try to edit some variable on assets/sass/_variable.scss (example $body-bg: red;). Nothing happen. The body still use bootstrap's default background-color. So, i try to inspect element and see what happen. i got the path of my compiled css wrong path.

this my css path:
<link rel="stylesheet" href="css/app.css">

this is example on inspect element result:
body {
font-family: "Raleway", sans-serif;
font-size: 14px;
line-height: 1.6;
color: #636b6f;
background-color: #f5f8fa;
}
i see on the right top on this css style reference into path http://tutorial.dev/css/node_modules/bootstrap-sass/assets/stylesheets/bootstrap/_scaffolding.scss

please help me solve this problem.
sory, for bad english.