Mobile Menu Level 2 is partially white while main color is 'greenish'

The main color of the menu is #009192. When opening the menu on a mobile phone on level 1 it is ok. When going into sublevel 2, I see partial white and green. How come? See screenshot?
website: www.springsvzw.be

Next custom css has been added:

/*
Je kunt hier je eigen CSS toevoegen.

Klik op het help icoon om meer te leren.
*/

/menu text color & font/
nav#site-navigation * {
color: #FFF;
font-size:10.5pt;
font-weight: bold;
opacity: 10;
}

/menu background color/
nav#site-navigation {
background: #009192;
}

/* hover color drop down menu*/
#page .menu > li a:hover {
color: #fff;
background: #195353;
}

.menu > li > ul > li > a {
color: #fff;
background: #009192;
}

/* disable search option on website */
#site-navigation .search-widget-handle {
display: none;
}

/Get rid off footer text 'Theme by Colorlib Powered by WordPress’/
.footer .footer-credits
{
display: none;
}

/Verwijdert naam en datum op een pagina net onder de titel/
.page-template-full-width .entry-meta { display: none;
}

/delete header section on pages/
.page-title-section {
display: none;
}

/Grootte logo’s carrousel partners & sponsors/
.logo-carousel img{
max-height: 125px;

}

/Bedrijfspakket pagina
body.page-id-2018 {
background-color: #000000;
}
.page-id-2018 h2 > a {
color:#ffffff !important;
font-weight:bold !important;
}
.page-id-2018 h4 {
color:#ffffff !important;
font-weight:bold !important;
}
/

/space between social media icons/
#social li {
padding: 0 10px 0 0;
}

.social-list a {
font-size: 50px;
}

/Contact field width/ input[type=‘text’], input[type=‘search’], input[type=‘email’], input[type=‘tel’]{
width: 100%;
}

.table>tbody>tr:hover {
background-color: #009192;
color: #ffffff;
}

.main-navigation .dropdown-menu > .active > a, .main-navigation .dropdown-menu > .active > a:focus{
background-color: #195353;
color: #009192;}

Hello there,

I hope you are doing well today.

You can use the following CSS code to fill out the white space by going to Appearance > Customize > Additional CSS and pasting it there.


/*Mobile menu background color*/
nav#site-navigation * {
    background-color: #009192;
}

Best Regards,
Support