Two divs bottom div to height adjust with browser window

This question already has an answer here:

Make a div fill the height of the remaining screen space 31 answers

---

try to use something like this code

html:

<div class = "main">
     Header
</div>
<div class="left">
    Bottom Div
</div>

css:

* {
    -webkit-box-sizing:border-box;
    -moz-box-sizing:border-box;
    box-sizing:border-box; 
}
html, body {
    height:100%;
} 
body {
    padding:60px 0 0 0; /* 60 — header height*/
    margin:0;
}
.main,
.left {
    border:1px solid #000;
}
.main {
    width:100%;
    height:60px;
    margin-top: -60px;  /* 60 — header height*/
}

.left {
    height: 100%;
    width: 300px;
}

---

You have a few options to achieve the layout you would like.

There are plenty of answers that address your problem from this similar question: Make a div fill the height of the remaining screen space

However, here is my solution: Just change your CSS a bit

body, html {
    height: 100%;
    padding: 0;
    margin: 0;
} 

.main {
    width:100%;
    height:60px;
    border: solid;
    position: absolute;
    background-color: #fff;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}

.left {
    height: 100%;
    width: 300px;
    border:solid;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    padding-top: 60px;
}

The box-sizing will prevent the padding-top and the borders from pushing the dimensions outside the browser window. The body,html height: 100%; is needed to allow other items to be 100% height (why your fiddle wouldn't work).

---

CSS allows you to do some basic math, so the following would help you:

Given that your header has a fixed height of 60px:

.left {
  height: calc(100% - 60px);
}

Edit: you also have some extra padding and borders that you might want to take into consideration while calculating. Although I'm not a big fan of hard-coding values like that.

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