Hello,

Please go to General Options > Header Options > Border Top & bottom for navigation, set it OFF.

Best regards!

Hello,

Please add this code into your custom css box:

.header_10 .full_nav_menu .container {
    border-top: none;
    border-bottom: none;
}

for the navigation borders.
I see you have edited the mobile menu icon color. Let us know if you still need help on that.

Best regards!

Hello,

Theme is perfectly responsive so it has a mobile menu available. What issue did you experience with it? Let us know so we can help you.

Best regards!

Hello,

To remove the header in mobile please add this code into your custom css box:

@media (max-width: 480px){
header#header { display: none;}
}

I will refer your suggestion to the developer team. If you have any other, please write at our Suggest Us Features forum.

Best regards!

Hello,

In your case it would be this code:

@media (max-width: 480px){
.header_wrapper.transparent.header_10 {
    display: none;
}}

Best regards!