Bootstrap 间隔 (Spacing)

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选择 Documentation — 选择Utilities — Spacing

2. margin 和 padding

Where property is one of:

m – for classes that set margin
p – for classes that set padding

Where sides is one of:

t – for classes that set margin-top or padding-top
b – for classes that set margin-bottom or padding-bottom
l – for classes that set margin-left or padding-left
r – for classes that set margin-right or padding-right
x – for classes that set both *-left and *-right
y – for classes that set both *-top and *-bottom
blank – for classes that set a margin or padding on all 4 sides of the element

Where size is one of:

0 – for classes that eliminate the margin or padding by setting it to 0
1 – (by default) for classes that set the margin or padding to $spacer * .25
2 – (by default) for classes that set the margin or padding to $spacer * .5
3 – (by default) for classes that set the margin or padding to $spacer
4 – (by default) for classes that set the margin or padding to $spacer * 1.5
5 – (by default) for classes that set the margin or padding to $spacer * 3
auto – for classes that set the margin to auto


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1&lt;div class=&quot;container&quot;&gt;

2    &lt;div class=&quot;bg-danger  m-5&quot;&gt;I am simple div&lt;/div&gt;

3    &lt;div class=&quot;bg-success m-4&quot;&gt;I am simple div&lt;/div&gt;

4    &lt;div class=&quot;bg-info m-3&quot;&gt;I am simple div&lt;/div&gt;

5    &lt;div class=&quot;bg-warning m-2&quot;&gt;I am simple div&lt;/div&gt;

6    &lt;div class=&quot;bg-primary m-1&quot;&gt;I am simple div&lt;/div&gt;

7    &lt;div class=&quot;bg-secondary m-0&quot;&gt;I am simple div&lt;/div&gt;

8    &lt;div class=&quot;bg-dark text-light m-0&quot;&gt;I am simple div&lt;/div&gt;

9&lt;/div&gt;

10&lt;br&gt;

11&lt;br&gt;

12&lt;br&gt;

13&lt;div class=&quot;container&quot;&gt;

14    &lt;div class=&quot;bg-danger  p-5&quot;&gt;I am simple div&lt;/div&gt;

15    &lt;div class=&quot;bg-success p-4&quot;&gt;I am simple div&lt;/div&gt;

16    &lt;div class=&quot;bg-info p-3&quot;&gt;I am simple div&lt;/div&gt;

17    &lt;div class=&quot;bg-warning p-2&quot;&gt;I am simple div&lt;/div&gt;

18    &lt;div class=&quot;bg-primary p-1&quot;&gt;I am simple div&lt;/div&gt;

19    &lt;div class=&quot;bg-secondary p-0&quot;&gt;I am simple div&lt;/div&gt;

20    &lt;div class=&quot;bg-dark text-light p-0&quot;&gt;I am simple div&lt;/div&gt;

21&lt;/div&gt;

22

23

24&lt;div class=&quot;container&quot;&gt;

25    &lt;div class=&quot;bg-danger  ml-5 ml-md-5&quot;&gt;I am simple div&lt;/div&gt;

26    &lt;div class=&quot;bg-success mt-4 mt-lg-5&quot;&gt;I am simple div&lt;/div&gt;

27    &lt;div class=&quot;bg-info mb-3 mb-sm-5&quot; &gt;I am simple div&lt;/div&gt;

28    &lt;div class=&quot;bg-warning mr-2&quot;&gt;I am simple div&lt;/div&gt;

29    &lt;div class=&quot;bg-primary m-1&quot;&gt;I am simple div&lt;/div&gt;

30    &lt;div class=&quot;bg-secondary m-0&quot;&gt;I am simple div&lt;/div&gt;

31    &lt;div class=&quot;bg-dark text-light m-0&quot;&gt;I am simple div&lt;/div&gt;

32&lt;/div&gt;

33

m-5

ml-5

ml-md-5

DIV水平居中


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1&lt;div class=&quot;container&quot;&gt;

2    &lt;div class=&quot;bg-danger  mx-auto w-25 text-center&quot;&gt;I am simple div&lt;/div&gt;

3&lt;/div&gt;

4

负margin(有负的margin，没有负的padding)


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1&lt;div class=&quot;row mx-md-n5 &quot;&gt;

2    &lt;div class=&quot;col px-md-5&quot;&gt;

3        &lt;div class=&quot;p-3 border bg-light&quot;&gt;Custom column padding&lt;/div&gt;

4    &lt;/div&gt;

5    &lt;div class=&quot;col px-md-5&quot;&gt;

6        &lt;div class=&quot;p-3 border bg-light&quot;&gt;Custom column padding&lt;/div&gt;

7    &lt;/div&gt;

8  &lt;/div&gt;

9

mx-n5 mx-md-n5

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