Creating special grid by using only flex functionalities - html

Question

I have to create a layout which looks like:
I've prepared code like:
.red {
width: 50px;
height: 50px;
background-color: red;
margin-right: 20px;
}
.yellow {
width: 50px;
height: 50px;
background-color: yellow;
}
.blue {
width: 50px;
height: 50px;
background-color: blue;
justify-self: end;
}
.wrapper {
display: flex;
background-color: green;
width: 100%;
}
<div class="wrapper">
<div class="red"> </div>
<div class="yellow"> </div>
<div class="blue"> </div>
</div>
But this blue div don't want to align to the right side:
Here you can a have a preview of that:
https://jsfiddle.net/ncszob80/17/
I know that I can fix it with margin-left: auto css style for blue div.
But I'm wondering if there is some possibility of creating such layout only by using flex functionality.
So:
we can use only flex functionalities
there needs to be some margin between red div and yellow one
blue div needs to be at the very right
How to achieve that?

Answer 1

You wrote:
I know that I can fix it with margin-left: auto css style for blue div. But I'm wondering if there is some possibility of creating such layout only by using flex functionality.
Actually, margin-left: auto is flex functionality. It's a feature of flex layout.
From the flexbox specification:
§ 8.1. Aligning with auto
margins
Also see:
In CSS Flexbox, why are there no "justify-items" and "justify-self" properties?
In summary, just use the auto margin. It's the cleanest, simplest and most efficient solution.

Answer 2

My best solution for you would be to change your DOM structure a little bit - but it accomplishes what you're looking for:
.left {
display: flex;
}
.red {
width: 50px;
height: 50px;
background-color: red;
margin-right: 20px;
}
.yellow {
width: 50px;
height: 50px;
background-color: yellow;
}
.blue {
width: 50px;
height: 50px;
background-color: blue;
}
.wrapper {
display: flex;
background-color: green;
width: 100%;
justify-content: space-between;
}
<div class="wrapper">
<div class="left">
<div class="red"> </div>
<div class="yellow"> </div>
</div>
<div class="right">
<div class="blue"> </div>
</div>
</div>
Basically, I wrapped your boxes in .left and .right, and then changed the .wrapper to justify-content: space-between so that the .right box is shoved to the right. Then, we make .left { display: flex; } to fix the issue with those boxes stacking without doing this, or changing the elements inside to display: inline; or display: inline-block;.

Answer 3

You can use nested flex boxes. Make the flex wrapper for your blue item and justify that to the end:
.wrapper {
display: flex;
background-color: green;
width: 100%;
}
.red {
width: 50px;
height: 50px;
background-color: red;
margin-right: 20px;
}
.yellow {
width: 50px;
height: 50px;
background-color: yellow;
}
.blueWrap {
width: 100%;
height: 50px;
display: flex;
justify-content: flex-end;
}
.blue {
width: 50px;
height: 50px;
background-color: blue;
}
<div class="wrapper">
<div class="red"> </div>
<div class="yellow"> </div>
<div class="blueWrap">
<div class="blue"></div>
</div>
</div>

Answer 4

Aside from changing your DOM structure or using the margin-left: auto fix CSS Grid is fantastic for this type of layout. I know you said only Flexbox but if you don't want any of the other solutions Grid might be a nice alternative. You can mix Flex functionality within the grid as well for finer control. I do this regularly to achieve the layout I'm in need of and it works well!
Happy coding!

Answer 5

Here is another idea if you don't want to consider margin:auto and without changing your html but like said in the accepted answer, margin is a feature of flexbox:
.red {
width: 50px;
height: 50px;
background-color: red;
margin-right: 20px;
}
.yellow {
width: 50px;
height: 50px;
background-color: yellow;
}
.blue {
width: 50px;
height: 50px;
background-color: blue;
order:1; /*make the blue the last element*/
}
.wrapper {
display: flex;
background-color: green;
width: 100%;
}
.wrapper:after {
content:"";
flex-grow:1; /*make this hidden element to take all the space and push the blue*/
}
<div class="wrapper">
<div class="red"> </div>
<div class="yellow"> </div>
<div class="blue"> </div>
</div>