You can use the following CSS code to increase the width and change the menu color by going to Appearance > Customize > Additional CSS and pasting it there.
HI there 4kapa… you can also use the hexadecimal color option to refine the color you want if it is outside the standard set
The first example below is a sort of purple whilst he second is white.
/Menu bar color/
.main-navigation {
background-color: #9646AE;
}
/Menu bar color/
.main-navigation {
background-color: #ffffff;
}
Using the hex code is very helpful if you want to add more color options to the theme. You can use an online color picker to choose the color that you want to use.