Remove Mobile Menu

Hello,

On mobile site the main menu takes up a lot of space at the top of the screen, and in addition there is the option to open the mobile menu (the three small lines you can click on).

I’d like to remove the static menu so it only appears when you click the three lines.

I tried adding:

`@media (max-width: 1080px) {
.main-navigation ul {
display: none;
}
}`

which worked to remove the static menu but when you click the three lines to open the mobile menu nothing happens.

Screenshot of page with static menu: https://drive.google.com/file/d/160IOWdrGjnzHlFtwim8yQ9CQ03eNbcUD/view?usp=sharing

Screenshot of page with static menu hidden, but also mobile menu does nothing:
https://drive.google.com/file/d/1AWw7FvhaS4BMCqAAKA7ZV7-_jNvUCioY/view?usp=sharing

The page I need help with: [log in to see the link]