Does bootstrap have builtin padding and margin classes?

Question

Does Bootstrap have built-in padding and margin classes like pad-10, mar-left-10 or I have to add my own custom classes? For example, similar to th

Answer 1

For bootstrap 4 we have new classes named with following notation

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

Specify Top, bottom,left, right, left & right, top & bottom using below letters

t - for classes that set margin-top (mt) or padding-top (pt)
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

Specify size using following numbers

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

Actual Code from bootstrap 4 css file

.mt-0 {
  margin-top: 0 !important;
}

.ml-1 {
  margin-left: ($spacer * .25) !important;
}

.px-2 {
  padding-left: ($spacer * .5) !important;
  padding-right: ($spacer * .5) !important;
}

.p-3 {
  padding: $spacer !important;
}

Usage

So when you need some padding left just add any class from pl-0 to pl-5 based on your need

If you need margin on top just add any class from mt-0 to mt-5 based on your need

 this div will have margin top added 
 this div will have padding left added 

Bootstrap 4 CDN