Grid

Rows

the .row class to set display to flex and flex-direction to flex-row

<div class="row">
    <p class="w-12">
        I'm a div .row
    </p> 
    <div class="col">
        I'm a div .col
    </div> 
    <div class="col">
        I'm a div .col
    </div> 
    <div class="col">
        I'm a div .col
    </div>
</div>

I'm a div .row

I'm a div .col
I'm a div .col
I'm a div .col

Columns

the .col class set display to flex and flex-direction to flex-column

<div class="row bg-light-blue-600 p-4 mb-4">
    <p class="mb-4  w-12">
        I'm a div .col
    </p> 
    <div class="row b p-4 bg-grey-400  bb-0  ">
        I'm a div .row
    </div>
    <div class="row b p-4 bg-grey-400  bb-0">
        I'm a div .row
    </div> 
    <div class="row b p-4 bg-grey-400 ">
        I'm a div .col
    </div>
</div>

I'm a div .col

I'm a div .row
I'm a div .row
I'm a div .col

Column width

the class .col-w-{ 1-12 } will change the width of a column

<div class="row bg-grey-200 p-4 mb-4">
    <div class="col b p-4 bg-grey-400  b  br  col-w-4">
        I'm a div .col-w-4
    </div> 
    <div class="col b p-4 bg-grey-400  col-w-8">
        I'm a div .col-w-8
    </div>
</div>
I'm a div .col-w-4
I'm a div .col-w-8

Fractions

you can also use fractions like .w-1/2 , w-3/4, w-2/6 w-4/12 in oder to change width and h-1/2 h-3/4 etc.

<div class=" bg-grey-200 p-4 mb-4">
    <div class=" b p-4 bg-grey-400  b  br  w-3/4">
        I'm a div .w-3/4
    </div> 
    <div class=" b p-4 bg-grey-400  w-6/12">
        I'm a div .w-6/12
    </div>
</div>
I'm a div .w-3/4
I'm a div .w-6/12