After putting sometime, I realised that it's very much possible with Plain CSS only. Using the Selector, Property and Value correctly.
Selector is normally the HTML element you want to style.
Each declaration consists of a property and a value.
The property is the style attribute you want to change. Each property has a value.
Here for getting Yahoo Widescreen effect as shown in iFrame above. We need to set two things.
background-repeat: no-repeat; and background-attachment: fixed;
So, a sample html code I have written below. Copy-Paste it to your local machine in .html format and open in browser to see the effect.
