SweetTokyoNight/gtk-3.0/widgets/_sidebar.scss

/***********
 * Sidebar *
 ***********/
.sidebar {
  border-style: none;
  border-width: 0;
  background-color: mix($bg_color, $base_color, 50%);

  .frame{
    border: none;
  }

  @at-root %sidebar_left,
  &:dir(ltr),
  &.left,
  &.left:dir(rtl) {
    border-right: none;
    border-left-style: none;
  }

  @at-root %sidebar_right
  &:dir(rtl),
  &.right {
    border-left: 1px solid $borders_color;
    border-right-style: none;
  }

  &:backdrop {
    background-color: $backdrop_sidebar_bg_color;
    border-color: $backdrop_borders_color;
    transition: $backdrop_transition;
  }

  row{
    padding: 8px 12px;
    transition: all .12s ease-in;
    label{
      color: #98abb2;
    }
    &:selected{
      color: #fff;
      // border-left: 4px solid $selected_bg_color;
      &:backdrop{
        color: $backdrop_selected_bg_color;
        background: transparent;
        label{
          color: #fff;
        }  
      }
      &:hover{
        // background-color: transparentize($selected_bg_color, 0.8);
      }
      label{
        color: #fff;
      }
    }
  }

    //elementary os file manager
    &.source-list{
      background: $base_color;
      padding: 4px 0px;
      &.view{
        transition: all .12s ease-in;
        &:selected {
          padding-left: 4px;
          background: transparentize(#eee, 0.5);
          color: #ACACAC;
          border-left: 4px solid $selected_bg_color;
          &:active { box-shadow: inset 0 2px 3px -1px transparentize(black, 0.5); }
    
          &.has-open-popup,
          &:hover { background-color: transparentize($selected_bg_color, 0.1); }
    
          &:backdrop { background-color: $backdrop_selected_bg_color; }
        }
        &:hover, iconview.source-list:hover { 
            background-color: if(variant == light, transparentize($bg_color, 0.6), transparentize($bg_color, 0.6)); 
        }
      }
    }
    

  paned & { &.left, &.right, &.left:dir(rtl), &:dir(rtl), &:dir(ltr), & {
    border-style: none;
    border-color: $borders_color;
  }
}
}

stacksidebar {
  &.sidebar {
    &:dir(ltr),
    &.left,
    &.left:dir(rtl) { list { @extend %sidebar_left; }}

    &:dir(rtl),
    &.right { list { @extend %sidebar_right; }}
  }

  row {
    padding: 10px 4px;

    > label {
      padding-left: 6px;
      padding-right: 6px;
    }

    &.needs-attention > label {
      @extend %needs_attention;

      background-size: 6px 6px, 0 0;
    }
  }
}

/*******************************************************************/
/*                  PLACESSIDEBAR                                  */
/*******************************************************************/

/*--*/

placessidebar{
  $_sidebar_color: if($variant == 'light', darken($main_dark_color, 3%), $main_dark_color);
	&.sidebar{
		background-color: transparent;
		background-image:linear-gradient(to right, darken($main_dark_color, 5%) 40px,
												$_sidebar_color 35px,$_sidebar_color 36px,
												$_sidebar_color 36px,$_sidebar_color 99%, 
												$_sidebar_color 100%);
		row{
			&.sidebar-row {
				margin-right: -14px;
				&.sidebar-row{
					.sidebar-icon {
			
						margin-left:-14px;
						margin-right: 12px;
						padding-left: 14px;
						padding-right: 12px;
						color: #98abb2;
					}
				}
				&:hover{
					transition: all 300ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
				
					color: rgba(0,0,0,0.76);
					background-color: transparent; /*rgba(65,67,75,0.4); */
					background-image:linear-gradient(to right, rgba(65,67,75,0) 40px, rgba(0,0,0,0.12) 40px,rgba(0,0,0,0.12) 97%);
				}

				&:active{
					&:hover{
						color: rgba(0,0,0,0.76);
						background-color: rgba(0,0,0,0.23);
					}
				}

				&:selected{
					color: #fff;
					background-color: transparent;
					background-image:linear-gradient(to right, $selected_bg_color 40px,
																rgba(65,67,75,0) 36px, rgba(65,67,75,0)97%);
					&:hover{
						color: #ffffff;
						background-color: rgba(0,0,0,0.24);
						.sidebar-icon {
							color: #ffffff;
						}
          }
          &:backdrop{
            color: rgba(0,0,0,0.54);;
            background-color: transparent;
            background-image:linear-gradient(to right, $selected_bg_color 40px,
                                  rgba(65,67,75,0) 36px, rgba(65,67,75,0)97%);
          }

					.sidebar-icon {
						-gtk-icon-shadow: 0 1px transparentize(#fff, 0.2);
						color: inherit; 
					}
				}

			}
		}
	}
	list{ 
		background-color: transparent; 

		&:backdrop { background-color: transparent; }
	}
  
  
}