fullwidth submenu

Hello, I would like to set the submenu as fullwidth, I mean the width of the entire browser window, not just the main menu one.
I tried:
.jux-dropdown-menu {
width: 100vw;
left: 50%;
right: 50%;
margin-left: -50vw;
margin-right: -50vw;
height: auto;
max-width: inherit!important;
display: inherit!important;
vertical-align: inherit!important;
border: inherit!important;
}

but the submenu remains aligned to the left margin of menu, not to the screen. What do you suggest I do?

I also have another problem: one of the second-level menu items does not appear in the third column.

Thank you, the problem with the sticky feature is not so minor, since scrolling back up hides the logo...

I can use also this:
.jux-dropdown-menu {
width: 100vw !important;
left: 50% !important;
transform: translateX(-55%) !important;
box-sizing: border-box !important;
margin-left: 0 !important;
padding-left: 0 !important;
}