nixos-configs/config/ags/scss/widgets/systray.scss

.sys-tray {
  padding: 5px;
  background-color: $bg;
  color: #CBA6F7;
  border-radius: 80px;
  border: 2px solid $bgSecondary;
  transition: background-color 0.5s ease-in-out,
              border 0.5s ease-in-out;

  .tray-item {
    all: unset;
    padding: 0px 2px 0px 2px;
    font-size: 25px;
    border-radius: 100%;
    transition: background-color 0.5s ease-in-out,
                border 0.5s ease-in-out;
    &:hover {
      background: rgba(127, 132, 156, 0.4);
      border-radius: 100%;
      transition: background-color 0.5s ease-in-out,
                  border 0.5s ease-in-out;
    }
  }

  menu {
    background: $bgfull;
    padding-top: 5px;
    padding-bottom: 5px;
    border: 2px solid #1b1b1b;
    border-radius: 10px;

    check {
      color: white;
      margin-left: 2px;
      margin-right: 5px;
      min-height: 20px;
      min-width: 20px;
      -gtk-icon-source: -gtk-icontheme('checkbox-symbolic');

      &:checked {
        -gtk-icon-source: -gtk-icontheme('checkbox-checked-symbolic');
      }
    }
  }

  menuitem:not(.tray-item) {
    padding: 5px;
    transition: all 0.2s ease-in-out;

    &:hover {
      background: #1b1b1b;
    }
  }
}