引导中的阴影示例
原文:https://www . geesforgeks . org/shadows-in-bootstrap-with-examples/
Bootstrap Shadow 是一个属性，它使用盒状阴影实用程序为元素提供阴影，强度因用户而异。当用户需要突出显示网页上的特定内容时，shadow 属性非常有用。
示例 1: 以下示例表示从无阴影效果到高阴影效果的 4 种不同阴影强度。它是使用实现的。div 元素中的阴影类。
<!DOCTYPE html>
<html lang="en">
<head>
<!-- Meta tags -->
<meta charset="utf-8">
<meta name="viewport" content=
"width=device-width, initial-scale=1,
shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css">
<title>Bootstrap 4 Shadow</title>
</head>
<body bgcolor>
<div class="container">
<h2>Shadow</h2>
<div class="shadow-none p-3 mb-5
bg-light rounded">No shadow</div>
<div class="shadow-sm p-3 mb-5
bg-white rounded">Small shadow</div>
<div class="shadow p-3 mb-5
bg-white rounded">Regular shadow</div>
<div class="shadow-lg p-3 mb-5
bg-white rounded">Larger shadow</div>
</div>
<!-- jQuery first, then Popper.js,
then Bootstrap JS -->
<script src=
"https://code.jquery.com/jquery-3.2.1.slim.min.js"
integrity=
"sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN"
crossorigin="anonymous">
</script>
<!-- Popper -->
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"
integrity=
"sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q"
crossorigin="anonymous">
</script>
<!-- Latest compiled and minified
Bootstrap JavaScript -->
<script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"
integrity=
"sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
crossorigin="anonymous">
</script>
</body>
</html>
输出:
示例 2: 以下示例表示悬停在阴影框上，即当光标指向框时显示阴影，当光标从框中移除时阴影消失。这个例子中阴影的强度很高。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible"
content="IE=edge">
<meta name="viewport" content=
"width=device-width, initial-scale=1">
<title>Bootstrap Shadow</title>
<!-- Bootstrap -->
<link rel="stylesheet" href=
"https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"
integrity=
"sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO"
crossorigin="anonymous">
<style>
.box-shadow-hover:hover {
box-shadow: 0 2px 5px 0
rgba(0, 0, 0, 0.5), 0
2px 10px 0 rgba(0, 0, 0, 1);
}
.pointer {
cursor: pointer;
}
img {
width: auto;
max-height: 100px;
}
</style>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-4 col-sm-6
col-xl-4 my-3">
<div class="card d-block h-100
box-shadow-hover pointer">
<div class="pt-3 h-75p
align-items-center d-flex
justify-content-center">
<img class="img-fluid w-xs-120p"
src=
"https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-6.png"
alt="valkyrie ship image">
</div>
<div class="card-body p-4">
<hr>
<p>
Bootstrap Shadow is a property
that provides shadow to an element
with box-shadow utilities, the
intensity can vary from user to
user. The shadow property can be
very much useful when the user needs
to highlight something specifically
on the web page.
</p>
<p>
Bootstrap Shadow is a property that
provides shadow to an element with
box-shadow utilities, the intensity
can vary from user to user. The
shadow property can be very much
useful when the user needs to
highlight something specifically
on the web page.
</p>
</div>
</div>
</div>
</div>
</div>
<!-- jQuery (necessary for Bootstrap's
JavaScript plugins) -->
<script src=
"https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js">
</script>
<!-- Include all compiled plugins (below),
or include individual files as needed -->
<script src=
"//maxcdn.bootstrapcdn.com/bootstrap/3.3.1/js/bootstrap.min.js">
</script>
</body>
</html>
输出:
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