Implement basic site design

[udidoron]

• Background color fitting with white colored text
• Elliptical buttons in a column for answers. Background color for answer changes to either green or red after clicking it, depending on whether the answer was correct/incorrect
• Question in a rounded-border box, with strong, large text. Question is swapped after answering.
• Time countdown on the side, with different color as the time goes down: regular before 20 seconds, warning-ish at 20 to 10 seconds, error-ish at 10 to 5 seconds, flashing at 5 to 0 seconds
• As timer ends, last question is replaced by 'Your Score': ..., and answers are replaced by 'Play again' button and 'Return to Start' button

[udidoron]

• Change: main wrapper has background color white, with blue colored text, allowing for answers to be colored whatever