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                <!doctype html>
<!-- forked from -->
<html lang="en">
    <title>Vertical demo</title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel = "stylesheet" type = "text/css" href = "./styles.css" />



        <div class="container">
            <div class="box box-1">box 1</div>
            <div class="box box-2">box 2
							Example for SO: <a href="">Fill remaining vertical space with CSS using display:flex</a>
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            <div class="box box-3">box 3</div>




    It is often useful to set box-sizing to border-box to layout elements. This makes dealing with the sizes of elements much easier, and generally eliminates a number of pitfalls you can stumble on while laying out your content.  
    On the other hand, when using position: relative or position: absolute, use of box-sizing: content-box allows the positioning values to be relative to the content, and independent of changes to border and padding sizes, which is sometimes desirable.*/
    box-sizing: border-box;
    margin: 0px;
	  padding: 0px;

/* ALL CONTAINER up to the flex container, including the flex container itself */
.container {
	/* necessary */
	height: 100%;
	min-height: 100%;

.container {
	/* for the flex container */
	display: flex;
	flex-direction: column;

.container .box {
	text-align: center;
	font-family: sans-serif;
	font-size: 30px;
	// padding: 20px;

	/* not necessary
    this is actually for the each box content to be aligned inside of it */
	// display: flex;
	// flex-direction: column;
	// justify-content: center;

.container .box-1 {
	background-color: red;
	// height is used for this cell as preferred
	// but not obeyed! when size of the page becomes too small to accomodate it
	// in that case it does contributes but not obeyed, as for example min-height
	// height: 400px;
	// if you uncoment flex, it will take precedence 
	// preferred over its (in this case) euqivalente
	// flex: 1;

.container .box-2 {
	background-color: blue;
	// height is not taken into consideration as a preffered size 
	// when flex directive is provided
	// says:
	/**  When a box is a flex item, flex is consulted **instead of the [main size property](** to determine the main size of the box */
	// height: 400px;
	flex: 1;
	overflow-y: auto;

.container .box-3 {
	background-color: white;
	// flex: 2;
	// it is overwritten by flex directive and not respected any more
	/* **WARNING**: if this value is set to smaller than necessary for the inner content to fit, we will endup with the overflow and vertical page scroller, which can surely avoided with `overflow-y: scroll;`*/
	height: 60px;
	// height: 30px;
	// overflow-y: scroll;
	// however, `min-height` is still taken in the consideration in the same manner, so if flex directive can be accomodated without breaking min-height, it will be, but if it cannot the min-height will be respected, even for the price of introducing the scroller on the whole page
	// min-height: 220px;
	// similar to `max-height`; it is still taken in the consideration
	// max-height: 100px;