【Bootstrap Learning】-5 Spacing

1. 選擇 Documentation -- 選擇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

 

<div class="container">
    <div class="bg-danger  m-5">I am simple div</div>
    <div class="bg-success m-4">I am simple div</div>
    <div class="bg-info m-3">I am simple div</div>
    <div class="bg-warning m-2">I am simple div</div>
    <div class="bg-primary m-1">I am simple div</div>
    <div class="bg-secondary m-0">I am simple div</div>
    <div class="bg-dark text-light m-0">I am simple div</div>
</div>
<br>
<br>
<br>
<div class="container">
    <div class="bg-danger  p-5">I am simple div</div>
    <div class="bg-success p-4">I am simple div</div>
    <div class="bg-info p-3">I am simple div</div>
    <div class="bg-warning p-2">I am simple div</div>
    <div class="bg-primary p-1">I am simple div</div>
    <div class="bg-secondary p-0">I am simple div</div>
    <div class="bg-dark text-light p-0">I am simple div</div>
</div>


<div class="container">
    <div class="bg-danger  ml-5 ml-md-5">I am simple div</div>
    <div class="bg-success mt-4 mt-lg-5">I am simple div</div>
    <div class="bg-info mb-3 mb-sm-5" >I am simple div</div>
    <div class="bg-warning mr-2">I am simple div</div>
    <div class="bg-primary m-1">I am simple div</div>
    <div class="bg-secondary m-0">I am simple div</div>
    <div class="bg-dark text-light m-0">I am simple div</div>
</div>

 m-5 

 ml-5

 ml-md-5

DIV水平居中

<div class="container">
    <div class="bg-danger  mx-auto w-25 text-center">I am simple div</div>
</div>

負margin(有負的margin，沒有負的padding)  

<div class="row mx-md-n5 ">
    <div class="col px-md-5">
        <div class="p-3 border bg-light">Custom column padding</div>
    </div>
    <div class="col px-md-5">
        <div class="p-3 border bg-light">Custom column padding</div>
    </div>
  </div>

   mx-n5 mx-md-n5