Hello Knud,
The width of the site is 1200px width for desktop. So, you can add the following CSS in the “Appearance => Customize => Additional CSS” box to increase the width. In the following CSS, you can increase the 1400px to your desired width.
@media screen and (min-width: 1280px ) {
/* Width for overall site */
.site {
max-width: 92%;
width: 1400px;
}
/* Width of the slider */
#feature-slider .cycle-slideshow {
max-width: 100%;
}
#feature-slider .cycle-slideshow img {
width: 100%;
}
/* Width of the content */
.two-columns #main {
width: 70%;
}
/* Width of the sidebar */
.two-columns .sidebar-primary {
width: 30%;
}
/* Width of the Footer Widgets */
#supplementary.four .widget-area {
width: 25%;
}
}
Regards,
Sakin