homepage/src/script/site.js

function updatemenu() {
    if (document.getElementById('responsive-menu').checked == true) {
        document.getElementById('menu').style.borderBottomRightRadius = '0';
        document.getElementById('menu').style.borderBottomLeftRadius = '0';
    } else {
        document.getElementById('menu').style.borderRadius = '30px';
    }
}