Hello there,
To change the background color of sidebar just use the below custom CSS code:
#page:before {
background-color: #ffffff;
}
@media only screen and (max-width: 767px) {
.main-navigation li,
.main-navigation ul li ul li {
border-color: rgba(0, 0, 0, 0.2);
}
}
@media only screen and (max-width: 767px) {
.site-header {
background-color: #ffffff;
}
}
Note: Change above HEX color code #ffffff to your own HEX color code to change the background color.
Thank you!