Fullwidth Sub Menu

Hello everybody
I have created a menu here.

Fullwidth Sub Menu

How can I format this via cms

for example
Font color
Font color mousover
Background color

have found and inserted this
But does not work
Probably 1 line wrong ?

//row1 and row 2 ???*/
.submenu-style-3.av-submenu-container,
.submenu-style-3.av-submenu-container .container {
background: transparent;
max-width: 100% !important;
}

.submenu-style-3.av-submenu-container .av-subnav-menu {
display: flex;
justify-content: space-around;
}

.submenu-style-3.av-submenu-container .av-subnav-menu > li {
flex-grow: 1;
}

.submenu-style-3.av-submenu-container .av-subnav-menu > li > a {
color: #FFF;
background: transparent;
border-left-width: 0px !important;
cursor: pointer;
}

.submenu-style-3.av-submenu-container .av-subnav-menu > li:nth-child(1) {
background-color: #4285f4;
}

.submenu-style-3.av-submenu-container .av-subnav-menu > li:nth-child(2) {
background-color: #34a853;
}

.submenu-style-3.av-submenu-container .av-subnav-menu > li:nth-child(3) {
background-color: #fbbc05;
}

.submenu-style-3.av-submenu-container .av-subnav-menu > li:nth-child(4) {
background-color: #ea4335;
}

many thanks a lot
and best regards
Franz