Set background color for mobile hamburger menu

[libmanuk]

.ukl-menu-button-more {
width: 7mm;
height: 7mm;
background-size: 100%;
/* inline SVG element! */
background-image: url('data:image/svg+xml;utf8,');
background-color: #0033a0;
border: 0px;
}

.ukl-menu-button-less {
display: block;
float: right;
justify-content:flex-end;
margin-left: auto;
width: 7mm;
height: 7mm;
background-size: 100%;
/* inline SVG element! */
background-image: url("data:image/svg+xml;charset=utf8,%3Csvg viewBox='0 0 32 32' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath stroke='rgba(255,255,255, 1)' stroke-width='2' stroke-linecap='round' stroke-miterlimit='10' d='M8 8 L24 24 M8 24 L24 8'/%3E%3C/svg%3E");
background-color: #0033a0;
border: 0px;
}

Add the background-color to the above CSS rules.