How to make 3 images in a 1x2 form in flexbox with the 2 equaling the height of the first? - flexbox

Question

So I want to make 3 images over 2 columns. The left image will be 100% of the height of the flexbox and I want to 2 right side images to be stacked top to bottom and their total height to equal the height of the left image or the flexbox height itself. When responsive resizing I want to keep this ratio as well.
The problem I'm having now is that upon resizing the left image shrinks and the combined height of the right 2 gets larger than the left image.
Thanks for trying to understand my jibberish.
I've tried a number of things and nothing working.

Answer 1

Using Flexbox
In order to accomplish what you are describing using flexbox you will need to use two flexboxes which will require making a few changes to the HTML.
The outer flexbox should have flex-direction: row; (this is the default value so it can be omitted). This will flex its children horizontally.
The inner flexbox should have flex-direction: column;. This will flex its children vertically.
The children of the first div should have flex: 1; which will distribute the space using an even ratio amongst the children.
You then just need to set height: 50%; for each of the images in the second flexbox.
Here's an example of what your code could look like:
.container,
body,
html {
width: 100%;
height: 100%;
margin: 0;
}
img {
object-fit: cover;
}
div {
display: flex;
}
img,
div {
flex: 1;
}
.right {
flex-direction: column;
}
.right>img {
height: 50%;
}
<div class="container">
<img src="https://source.unsplash.com/random?mountain">
<div class="right">
<img src="https://source.unsplash.com/random?city">
<img src="https://source.unsplash.com/random?cat">
</div>
</div>