dots/usr/share/themes/Dracula/gtk-3.20/widgets/_toolbars.scss

/************
 * Toolbars *
 ************/
%toolbar {
  -GtkWidget-window-dragging: true;
  padding: 4px;
  background-color: $bg_color;
}

toolbar {
  @extend %toolbar;

  padding: 4px 3px 3px 4px;

  // on OSD
  .osd & { background-color: transparent; }

  // stand-alone OSD toolbars
  &.osd {
    padding: 13px;
    border: none;
    border-radius: 5px;
    background-color: $osd_bg_color;

    &.left,
    &.right,
    &.top,
    &.bottom { border-radius: 0; } // positional classes for `attached` osd toolbars
  }

  // toolbar separators
  &.horizontal separator { margin: 0 7px 1px 6px; }
  &.vertical separator { margin: 6px 1px 7px 0; }

  &:not(.inline-toolbar):not(.osd) {
    switch,
    scale,
    entry,
    spinbutton,
    button {
      margin-right: 1px;
      margin-bottom: 1px;
    }
  }
}

//searchbar, location-bar & inline-toolbar
.inline-toolbar {
  @extend %toolbar;

  @extend %darkbar;

  padding: 3px;
  border-width: 0 1px 1px;
  border-radius: 0  0 5px 5px;
}

searchbar,
.location-bar {
  @extend %toolbar;

  @extend %darkbar;

  border-width: 0 0 1px;
  padding: 3px;
}

%darkbar {
  border-style: solid;
  border-color: $borders_color;
  $_bg: mix($bg_color, $borders_color, 70%);
  background-color: $_bg;

  &:backdrop {
    border-color: $backdrop_borders_color;
    background-color: $backdrop_dark_fill;
    box-shadow: none;
    transition: $backdrop_transition;
  }
}

searchbar{
  background: $base_color;
}