尺寸（Sizing）
使用寬度和高度通用類別，可以輕松地將一個元素加寬或增高。
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相對于父元素
寬度和高度通用類別從_utilities.scss中產生。預設包含25%，50%，75%，100%和auto。按你的需求調整這些值，可產生不同的屬性。
Width 25%
Width 50%
Width 75%
Width 100%
Width auto
<div class="w-25 p-3" style="background-color: #eee;">Width 25%</div>
<div class="w-50 p-3" style="background-color: #eee;">Width 50%</div>
<div class="w-75 p-3" style="background-color: #eee;">Width 75%</div>
<div class="w-100 p-3" style="background-color: #eee;">Width 100%</div>
<div class="w-auto p-3" style="background-color: #eee;">Width auto</div>Height 25%
Height 50%
Height 75%
Height 100%
Height auto
<div style="height: 100px; background-color: rgba(255,0,0,0.1);">
<div class="h-25 d-inline-block" style="width: 120px; background-color: rgba(0,0,255,.1)">Height 25%</div>
<div class="h-50 d-inline-block" style="width: 120px; background-color: rgba(0,0,255,.1)">Height 50%</div>
<div class="h-75 d-inline-block" style="width: 120px; background-color: rgba(0,0,255,.1)">Height 75%</div>
<div class="h-100 d-inline-block" style="width: 120px; background-color: rgba(0,0,255,.1)">Height 100%</div>
<div class="h-auto d-inline-block" style="width: 120px; background-color: rgba(0,0,255,.1)">Height auto</div>
</div>您還可以根據需求使用max-width: 100%；和max-height: 100%；通用類別。
<img src="..." class="mw-100" alt="...">Max-height 100%
<div style="height: 100px; background-color: rgba(255,0,0,.1);">
<div class="mh-100" style="width: 100px; height: 200px; background-color: rgba(0,0,255,.1);">Max-height 100%</div>
</div>相對于視窗
您還可以使用通用類別來設定相對于視窗的寬度和高度。
<div class="min-vw-100">Min-width 100vw</div>
<div class="min-vh-100">Min-height 100vh</div>
<div class="vw-100">Width 100vw</div>
<div class="vh-100">Height 100vh</div>
Sass
Utilities API
Sizing utilities are declared in our utilities API in scss/_utilities.scss.
"width": (
property: width,
class: w,
values: (
25: 25%,
50: 50%,
75: 75%,
100: 100%,
auto: auto
)
),
"max-width": (
property: max-width,
class: mw,
values: (100: 100%)
),
"viewport-width": (
property: width,
class: vw,
values: (100: 100vw)
),
"min-viewport-width": (
property: min-width,
class: min-vw,
values: (100: 100vw)
),
"height": (
property: height,
class: h,
values: (
25: 25%,
50: 50%,
75: 75%,
100: 100%,
auto: auto
)
),
"max-height": (
property: max-height,
class: mh,
values: (100: 100%)
),
"viewport-height": (
property: height,
class: vh,
values: (100: 100vh)
),
"min-viewport-height": (
property: min-height,
class: min-vh,
values: (100: 100vh)
),