陰影（Shadows）
使用box-shadow通用類別來增加或移除陰影。
On this page
例子
雖然在Bootstrap中元件上的陰影預設被禁用，且可透過$enable-shadows啟用，你也可以使用我們的box-shadow通用類別快速增加或移除陰影。包括對.shadow-none和其他三個預設大小的支持（有相關的變數用以對應）。
No shadow
Small shadow
Regular shadow
Larger shadow
<div class="shadow-none p-3 mb-5 bg-light rounded">No shadow</div>
<div class="shadow-sm p-3 mb-5 bg-body rounded">Small shadow</div>
<div class="shadow p-3 mb-5 bg-body rounded">Regular shadow</div>
<div class="shadow-lg p-3 mb-5 bg-body rounded">Larger shadow</div>Sass
Variables
$box-shadow: 0 .5rem 1rem rgba($black, .15);
$box-shadow-sm: 0 .125rem .25rem rgba($black, .075);
$box-shadow-lg: 0 1rem 3rem rgba($black, .175);
$box-shadow-inset: inset 0 1px 2px rgba($black, .075);
Utilities API
Shadow utilities are declared in our utilities API in scss/_utilities.scss.
"shadow": (
property: box-shadow,
class: shadow,
values: (
null: $box-shadow,
sm: $box-shadow-sm,
lg: $box-shadow-lg,
none: none,
)
),