How to make a div center in Bootstrap3?

Question

User264732274 posted

just read this article http://victorshi.com/blog/post/How-to-make-a-div-center-in-Bootstrap3

it come with some solution to make a div appear center of page but their offset logic is not clear to me.

their code

<div class="row">
   <div class="col-lg-6 col-lg-offset-3 text-center">center</div>
</div>

what is the meaning of col-lg-offset-3 ?

why they said So for example, a column of size 6 would be centred by adding an offset of 3, that's (12-6)/2.

why the calculation is (12-6)/2 ?

please help me to understand their calculation and also guide me what offset does here ?

thanks

Answer 1

User475983607 posted

Well, the total width is 12 units.  If the cell is 6 units and the offset is 3 units then 3 + 6 = 9  which leaves 3 units 12 - 9 = 3. Therefore, the 6 unit cell width is centered... ie. 3 + 6 + 3.

This function is simply another way to figure out the same thing; (12-6)/2.  This means take away 6 units from 12.  That leaves use 6. then divide by 2 that gives us the two outside widths.  This is really just basic math.

Answer 2

User264732274 posted

what offset col-lg-offset-3 does ?

u said  If the cell is 6 units and the offset is 3 units then 3 + 6 = 9

if i need to add 6 then i can use col-lg-9 instead of col-lg-6....am i right ?

why should i use offset ?

please tell me in what kind of situation people work with bootstrap offset class ?

help me to understand with easy example code for offset use.

thanks

Answer 3

User475983607 posted

what offset col-lg-offset-3 does ?

It offsets a cell by 3 units to the right.  If you want to know specifics of how it is done then read the CSS.  It's open source.

if i need to add 6 then i can use col-lg-9 instead of col-lg-6....am i right ?

I have no idea what you're asking.  At this point, it seems that you're are asking for help with rudimentary math?

why should i use offset ?

please tell me in what kind of situation people work with bootstrap offset class ?

For one, to center a cell as outline in your original post!

help me to understand with easy example code for offset use.

The offset CSS is like a tool that you have in your toolbox and you can use this tool when you see fit.  

Keep in mind, this is a support forum not your personal tutor.  If you want to know more about how offset works, I suggest that you build a simple test page and experiment.