Add scrolling feature for multi-line tutorial texts

[sangjunp4rk]

After you type and complete an exercise, in the review page you only see the last line and cannot see or scroll to previous lines. So user can't understand what they did right or wrong.

Current. Note that you cannot see the first 2-3 lines. Just the end is shown. By default, we should start by showing the first few lines instead of the last line

**Also change UI to make it more like this **