Squarespace 7.1 - Hamburger Menu Background

Site URL: https://www.questfinancialcoaching.com/

Can someone help me add a background to the hamburger menu?  I'd like to add a background that covers both the hamburger menu + the word "MENU." Right now it just covers "MENU"

Similar to this example - https://jana.showit.site/

Try this CSS

.header-burger {
    background-color: #9c8b7e;
    padding: 9px;
    position: relative;
}