Major Problem with 100% Height Div

#div1{    width:1024px;    height:1000px;    background:red;    overflow:hidden;}#div2{        float:left;    width:100%;    height:inherit;    background:yellow;}#div3{        float:left;    width:460px;    height:inherit;    background-image:url('http://www.ricoh-imaging.co.jp/english/r_dc/caplio/r7/img/sample_04.jpg');    background-size:100% 100%;    background-position:bottom;    background-repeat:no-repeat;}
#div4{    float:left;     width:270px;    height:inherit;    background:violet;}
#div5{    float:left;    width:25px;    height:inherit;    background:black;}
#div6{    float:left;    width:269px;    height:inherit;    background:blue;}

<div id="div1" class="center">    <div id="div2">        <div id="div3"></div>        <div id="div4"></div>        <div id="div5" ></div>        <div id="div6"></div>    </div></div>

Div with 100% height overflowing body in Chrome

The problem seems to stem from the fact that you're combining both the height and flex-basis properties in the same declaration block. It appears to create a conflict. In my answer below I've removed the heights and used flex-basis instead. You'll note a couple of other adjustments, as well.

Change:

(1)

<div class="green-border"
style="flex: 1 1 auto; display: flex; flex-direction: row; width: 100%; height: 100%;" >

TO

<div class="green-border"
style="flex: 1 1 100%; display: flex; flex-direction: row; width: 100%;" >

notes: removed height; used flex-basis instead;

(2)

<div style="flex: 1 1 auto; width: 100%; height: 100%;">

TO

<div style="flex: 1 1 100%; width: 100%; display: flex;">

notes: removed height; used flex-basis instead; established nested flex container;

(3)

<div style="background-color: #ff6500; width: 100%; height: 100%;">center</div>

TO

<div style="background-color: #ff6500; width: 100%; flex: 1 1 100%;">center</div>

notes: removed height; used flex-basis instead; added flex property;

Lastly, the blue border wasn't showing due to a typo.

(4)

clsas="blue-border"

TO

class="blue-border"

With the adjustments above, the layout renders in Chrome like this:

All boxes lie within their containers.

DEMO

Applying 100% height to nested, non-flex elements

In most cases, when using percentage heights on child elements, a percentage height must also be specified for the parent element and all ancestor elements, up to and including the root element.

html, body { height: 100%; }

I have explained the reason for this here:

• Working with the CSS height property and percentage values

But a close look at the spec reveals an exception:

The percentage is calculated with respect to the height of the
generated box's containing block. If the height of the containing
block is not specified explicitly (i.e., it depends on content
height), and this element is not absolutely positioned, the value
computes to 'auto'.

Note the part: ... and the element is not absolutely positioned.

Hence, try this on the "center" box:

Change:

(5)

<div style="background-color: #ff6500; width: 100%; flex: 1 1 100%;">center</div>

TO

<div style="background-color: #ff6500; width: 100%; flex: 1 1 100%; position: relative;">
    <div style="border: 5px solid yellow; position: absolute; height: 100%; width: 100%;">
       center</div>
</div>

Notes:

• added position: relative to establish nearest positioned ancestor for absolute positioning
• created new, nested, non-flex div container
• applied absolute positioning to new div with height: 100%.

With absolute positioning you do not need to apply percentage heights to parent containers.

DEMO

CSS: 100% Height Issues

An element positioned absolute doesn't affect the wrapping elements in any way. So the height of your div#static-maincontent doesn't really translate to div#static-content... it just floats above all other elements.

• Remove all position:absolute
• give div#sidebar a float:left
• give div#static-maincontent a float:right
• add something like <div style="clear:both;"> after div#static-maincontent and INSIDE div#static-content
• remove height: 100% from div#static-content

This should work (at least with firebug).

How to force child div to be 100% of parent div's height without specifying parent's height?

NOTE: This answer is applicable to legacy browsers without support for the Flexbox standard. For a modern approach, see: https://stackoverflow.com/a/23300532/1155721

I suggest you take a look at Equal Height Columns with Cross-Browser CSS and No Hacks.

Basically, doing this with CSS in a browser compatible way is not trivial (but trivial with tables) so find yourself an appropriate pre-packaged solution.

Also, the answer varies on whether you want 100% height or equal height. Usually it's equal height. If it's 100% height the answer is slightly different.

Why div is not taking full height on mobile divice

You need to add flex-direction: column to main. And use flex-grow: 1 to main-content so it covers the remaining space ( if you want that )

The default property value is row. So main and sidebar are side by side and equal in height which is equal to the height of their container( default flex behavior )

.main {  min-height: 100vh;  background-color: red;  display: flex;  flex-wrap: wrap;  flex-direction:column;
}
.sidebar {  background-color: blue;  height: 100px;  width: 100%;}
.main-content {  background-color: yellow;  flex-grow:1;  width: 100%;}
@media (min-width:768px) {  .main-content{  width: 80%;}   .sidebar {    width: 20%  }  .main {    flex-direction:row; }}

<div>Header</div><div class="main">  <div class="sidebar">    sidebar  </div>  <div class="main-content">    main-content  </div></div>