[$10] - Challenge Description text overflowing

[shubhendusaurabh]

If the challenge description contains long text inside pre tag, the text is overflowing.

https://www.topcoder.com/challenge-details/30056829/?type=develop

cc @birdofpreyru

[birdofpreyru]

Let's, in case of overflow, turn such blocks of unformatted text into scrollable containers. While mantaining original stying as a regular paragraph, when there is no overflow.

[birdofpreyru]

@shubhendusaurabh Do you want to fix it yourself?