Reply To: Slow website

Hi, please if you click on url above (Private reply 321) and after on first article in portfolio (Drive…),

1 – there is on top blue picture with a car. My question please is, how reduce (remove) the gap between lower part the picture and the thin line. And also how remowe the thin white line.
2 – there is also sidebar and yellow items on top. My question please is, how reduce (remove) the gap above this yelow item.

Thank you a have a nice day!