Move two navigation links to right side

Site URL: https://mushroom-turquoise-9rne.squarespace.com/

Password: siera

Hoping to get some help as I'm pretty new to coding... 

I needed to create two buttons in my header, so I followed someone else's advice and converted the last two of my navigation links into buttons. Now I need to move them to the right side of the page so they're not in line with the rest of the nav links on the left side of the page. 

Here is the code I use to convert the two nav links into buttons. 

Thank you in advance!!

// 2 Navigation Buttons //

.header-nav-item:nth-child(5) a, .header-nav-item:nth-child(6) a {
  background: #912812 !important;
  color: #FFFFFF !important;
  width: auto;
  border-radius: 10px;
  text-align: center !important;
  text-transform: uppercase; padding: 12px !important}

// Navigation Padding //

.header-nav-item a {
  padding: 3px !important;
}

// Active Navigation Line //

.header-nav-item--active a {
  background-image: none !important;
}

Don't remove any code in your current code. Add to Design > Custom CSS

div.header-nav-item:nth-child(6) {
    position: absolute;
    right: 0;
}
div.header-nav-item:nth-child(5) {
    position: absolute;
    right: 12vw;
}