Menu Icon not showing correctly in mobile version

Hi @ducclub,

Thanks for reaching us,

Please try adding this CSS inside WordPress Dashboard > Appearances > Customize > Additional CSS and check it once?

@media screen and (max-width: 768px){
.tg-mobile-toggle button {
background-color: #fff;
}
}

Let me know if this helps you or not and I will be back.

Regards

Thanks, it solved the problem!