Transparent background on dropdown menu

Site URL: https://cyan-oriole-hy6e.squarespace.com/

I have been trying to make the background on the dropdown menu transparent but can't seem to make anything work. I have tried this the following but the background is still there. Also trying to get a hover underline on the drop down links without making the «Table of Contents» title also have an underline. PLEASE any suggestions? 

I have tried the following for example. Does not work. 

.header-nav-folder-content {
  background: transparent;
}

1 hour ago, Lillayla said:

Site URL: https://cyan-oriole-hy6e.squarespace.com/

I have been trying to make the background on the dropdown menu transparent but can't seem to make anything work. I have tried this the following but the background is still there. Also trying to get a hover underline on the drop down links without making the «Table of Contents» title also have an underline. PLEASE any suggestions? 

I have tried the following for example. Does not work. 

.header-nav-folder-content {
  background: transparent;
}

Try adding to Home > Design > Custom Css

.header-nav-folder-content {
  background: transparent !important;
}
.header-nav-folder-title:after, .header-nav-folder-content .header-nav-folder-item a:after {
  content: '';
  display: block;
  width: 0;
  height: 1px;
  background: #fff; /*color of line*/
  position: absolute;
  transition: width 0.3s;
}
.header-nav-folder-content .header-nav-folder-item a {
  display:inline-block;
  position: relative;
}
.header-nav-item:hover .header-nav-folder-title:after, .header-nav-folder-content .header-nav-folder-item a:hover:after {
  width: 100%;
}

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My testing

I figured it out. Thank you 🙂