Removing the header button

Hi,

Thank you for the amazing theme.
I will like to know how to remove the two button on the header.
I have added the following to the custom css

.header-button {
display: none;
}
.header-text {
width: 100%;
position: absolute;
}
.header-text {
top: 60px;
}

these code works fine with the website view, but not on the tablet and mobile devices…
it will be appreciated if you can help me out here.

Thanks!