Yellow Box, make full bleed to navigation

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I  am trying to make the yellow square, full bleed into the navigation, so half is light grey and half is yellow. any ideas of code?

13 minutes ago, Ziggy said:

Try this Custom CSS:

@media (min-width: 768px) {
  .fe-block-yui_3_17_2_1_1674490945592_5863 {
    margin-top: -250px;
  }
}

Let me know if that works on desktop!

Yeeee worked great thanks!!

4 minutes ago, LindsEli said:

Yeeee worked great thanks!!

No problem! Can you mark my reply as the solution and give a thumbs up? Thanks!

You might want to increase the -250px to -500px just so it reaches to the very top on wider screens.