Maximizing header in Adirondack template with CSS?

Hi, I use the Adirondack template and want to maximize the header width (only the header width) to full screen, for all pages. Since the Adirondack template has a maximized width, I assume I need custom CSS to make this adjustment. Anyone tips? (click image; the background is white so only when clicking can you see the current width)

Can you provide link to your site?

Hi Tuanphan, sorry for the late response. My website is www.aclaradesign.nl. Hope you can help!

On 1/27/2020 at 8:51 PM, AnnaPM said:

Hi Tuanphan, sorry for the late response. My website is www.aclaradesign.nl. Hope you can help!

Add to Home > Design > Custom CSS

@media screen and (min-width:901px) {
/* Set fullwidth all site */
.outer-wrapper {
    width: 100%;
}
/* Set fullwidth header */
header#header {
    width: 100%;
}
/* Set padding all elements not header */
.outer-wrapper>.wrapper #content {
    margin-left: 10vw;
    margin-right: 10vw;
}
}