How to move navigation to the left?

there is a solution in here https://www.designbombs.com/master-twenty-sixteen-wordpress-theme/

possibly add this CSS via the ‘Zus?tzliches CSS’ under ‘Design’ – ‘Customizer’:

@media screen and (min-width: 56.875em) {
.sidebar {
float: left;
margin-right: 75%;
margin-left: 0;
}

.content-area {
float: right;
margin-right: 0;
margin-left: -100%;

}
}

Thanks Michael! In the meantime, I found a workaround. No idea what I was doing, but it worked ??
Best,
Hanna