How to implement fixed sidebar correctly? - css

Question

I'm trying to accomplish this design:
Where the sidebar will be fixed, but the right side (the main content) will scroll vertically (and potentially horizontally if the user's browser window is smaller). What is the best way to achieve this?
I tried making the sidebar be "fixed" with a fixed width of 200px, and then the main content just has a margin-left of 200px. However, if the user's browser is then smaller than the main content, the sidebar overlaps all the content as the user tries to scroll horizontally.
Is there a smarter way to achieve this? Thanks!

Answer 1

Use the content div as your container for the page.
.sidebar {
position: fixed;
width: 200px;
height: 400px;
background: #000;
}
.content {
margin-left: 200px;
height: 500px;
width: auto;
position: relative;
background: #f00;
overflow: auto;
z-index: 1;
}
.info {
width: 1440px;
height: 300px;
position: relative;
background: #f55;
}
<div class="sidebar"></div>
<div class="content">
<div class="info"></div>
</div>
Your content will need to be the container to put the page in. The values here are my test to see if I am correct in this. If your width and height exceeds the values you set for content, the scroll bars will appear.
Have a fiddle: http://jsfiddle.net/djwave28/JZ52u/
edit: responsive sidebar
To have a responsive fixed sidebar, simply add a media-query.
Example:
#media (min-width:600px) {
.sidebar {
width: 250px;
}
.content {
margin-left: 250px;
}
}
Here's another fiddle: http://jsfiddle.net/djwave28/JZ52u/363/

Answer 2

Here is an alternative: http://jsfiddle.net/BoyWonder/8mVQX/embedded/result/
body{
padding-left:200px;
margin:0;
}
div#sidebar{
position:fixed;
height:100%;
width:200px;
top:0;
left:0;
background:grey;
}
div#content{
background:black;
width:100%;
height:1600px;
}

Answer 3

Here is another alternative by using only two CSS lines
.sidebar {
position: sticky;
top: 0;
}
and the credit goes to this post.
You can also experiment with the code over here.