Vertical scroll bar with 100% height? - html

Question

I'm having an issue here. Simple layout with header, nav bar, and content divs inside of a container with 100% height, but I'm still getting a vertical scroll bar.
style.css
html, body {
margin: 0px;
padding: 0;
background: #E6E6E6;
}
#container{
width: 900px;
height: 100%;
position: relative;
left: 450px;
}
#header{
width: 900px;
height: 70px;
position: absolute;
background-color: #FFFFFF;
border: 1px solid black;
}
#navBar{
width: 900px;
height:20px;
position: absolute;
top: 77px;
background-color: #FFFFFF;
border: 1px solid black;
}
#content{
width: 900px;
height: 100%;
position: absolute;
top: 104px;
background-color: #FFFFFF;
border: 1px solid black;
}

Answer 1

according to your comment about overflow: hidden removing a border try this:
overflow-y: hidden;
that only removes the vertical scrollbar, like you asked.

Answer 2

Assuming that #header, #navbar and #content are children of container, the reason is quite obvious. #content is also set to 100% height and additionally has a top value. So, it's full height and then shifted down, of course resulting in a vertical scrollbar.
One solution would be to add
overflow: hidden;
to #container, but that would just cut the content. You need to calculate the height correctly:
#content { height: calc(100% - 106px); }
See the DEMO.
Additional information: I substract 106px due to the top margin of 104 plus 2px for the borders.

Answer 3

your height: 100% in the #container { causes this problem.
if you want to fix this, you have to set bottom: 0
JSFiddle
html, body {
margin: 0px;
padding: 0;
background: #E6E6E6;
height: 100%; /* added this to html,body*/
}
#content{
width: 900px;
bottom: 0; /* set this instead of height: 100%*/
position: absolute;
top: 104px;
background-color: #FFFFFF;
border: 1px solid black;
}