Single Page hamburger menu - Forced to one page only

Site URL: https://franklywrite.squarespace.com/home

Hi Team, I have tried a number of codes from different responses in the forum and nothing seems to be working... is anyone able to assist me in forcing a hamburger menu for this page 

https://franklywrite.squarespace.com/home 

I have been trying the below - But it keeps blanking out the menu and not showing anything. I can't work out why!! 

//Hamburger Menu Home Page//

body#collection-620dde5869dba9120dfd8979{

@media screen and (min-width:768px) {

/* hide navigation */

    .header-nav {

    display: none;

}

/* Hide header button */

.header-actions {

    display: none;

}

/* show burger */

.header-burger {

  display: flex;

}

/* Show overlay mobile menu */

.header--menu-open .header-menu {

opacity: 1;

visibility: visible;

}

}}

Hi @tillie it works fine without wrapping it in the collection ID. so just put this in the header injection on the specific page you want to change.
 

<style>
/*Turn mobile menu on all sizes*/
/* 768 for tablet - desktop - 992 for desktop */
@media screen and (min-width:768px) {
 /* hide navigation */
    .header-nav {
    display: none;
}
/* Hide header button */
.header-actions {
    display: none;
}
/* show burger */
.header-burger {
  display: flex;
}
/* Show overlay mobile menu */
.header--menu-open .header-menu {
opacity: 1;
visibility: visible;
}
}
</style>

@houghtoncreative Ah of course! Thank you for the prompt! Works perfectly