Hello,
yes you can change this with CSS code.
Go to the wp-content\themes\revelance\css\responsive.css
file and go to the line 162, you will see code looking like this:
#ABdev_menu_toggle {
display: block;
width: 32px;
height: 32px;
position: absolute;
right: 0;
top: 10px;
font-size: 24px;
z-index: 2000;
}
change it with this one:
#ABdev_menu_toggle {
display: block;
width: 32px;
height: 32px;
position: absolute;
right: 0;
top: 10px;
font-size: 24px;
z-index: 2000;
color: #fff !important;
}
this will change the color of toggle button to white.