Removing the header button


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.