how to overwrite bootstrap style code example
Example 1: bootstrap override css
If your custom styles are not overriding the bootstrap styles, all you
need to do is move the link to your custom stylesheet to a line after
the bootstrap link:
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet">
<link rel="stylesheet" href="styles.css">
This means that you first load the default bootstrap styles, then you
can override some of those components with your own custom CSS.
Example 2: bootstrap can i override css locally
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="bootstrap/css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="custom.css">
<title>Hello, world!</title>
</head>
<body>
<h1>Hello, world!</h1>
</body>
</html>