<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap button</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Button Styles</h2>
<button type="button" class="btn">Базовая</button>
<button type="button" class="btn btn-primary">Основная</button>
<button type="button" class="btn btn-secondary">Вторичный</button>
<button type="button" class="btn btn-success">Успех</button>
<button type="button" class="btn btn-info">Информация</button>
<button type="button" class="btn btn-warning">Предупреждение</button>
<button type="button" class="btn btn-danger">Опасность</button>
<button type="button" class="btn btn-dark">Темный</button>
<button type="button" class="btn btn-light">Свет</button>
<button type="button" class="btn btn-link">Ссылка</button>
</div>
<br><br><br>
<div class="container">
<h2>Button Outline</h2>
<button type="button" class="btn btn-outline-primary">Основная</button>
<button type="button" class="btn btn-outline-secondary">Вторичный</button>
<button type="button" class="btn btn-outline-success">Успех</button>
<button type="button" class="btn btn-outline-info">Информация</button>
<button type="button" class="btn btn-outline-warning">Предупреждение</button>
<button type="button" class="btn btn-outline-danger">Опасность</button>
<button type="button" class="btn btn-outline-dark">Темный</button>
<button type="button" class="btn btn-outline-light text-dark">Свет</button>
</div>
<br><br><br>
<div class="container">
<h2>Block Level Buttons</h2>
<button type="button" class="btn btn-primary btn-block">Кнопка уровня блока</button>
</body>
</html>
css