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

/**************
 * GtkInfoBar *
 **************/
%infobar,
infobar {
  text-shadow: none;
  color: $fg_color;
  background-color: $bg_color;
  border-bottom:1px solid darken($bg_color,10%);
  box-shadow: 0 1px 0 0 transparentize(black, 0.95),
              0 1px 2px 0 transparentize(black, 0.85);

}

%color_infobar {

  @extend %infobar;

  text-shadow: none;
  color: $selected_fg_color;
  border:none;

  .label {
    color: $selected_fg_color;

    &:backdrop {
      color: $backdrop_selected_fg_color;
    }
  }

  button {
    border-radius: 2px;
    border: none;
    background: transparentize($base_color, 0.02);
    color: $fg_color;
    box-shadow: 0 1px 0 0 transparentize(black, 0.8);

    .label {
      color: $fg_color;
    }

    &:active {
      background: $base_color;
      color: $fg_color;

      box-shadow: 0 1px 2px 0 transparentize(black, 0.6);

      &:backdrop {
        background: transparentize($base_color, 0.2);
        color: transparentize($fg_color, 0.5);
        box-shadow: none;
      }
    }

    &:hover,
    &:focus {
      box-shadow: 0 1px 2px 0 transparentize(black, 0.6);
    }

    &:disabled {
      background: transparentize($base_color, 0.4);
      color: transparentize($fg_color, 0.5);
      box-shadow: none;

        &:backdrop {
          background: transparentize($base_color, 0.5);
          color: transparentize($fg_color, 0.5);
          box-shadow: none;
        }
    }

    &:backdrop {
      background: transparentize($base_color, 0.2);
      color: transparentize($fg_color, 0.5);
      box-shadow: none;
    }
  }
}

.info {
  @extend %color_infobar;
  background-color: $info_color;

  &:backdrop {
    background-color:lighten($info_color,10%);
    color: $backdrop_selected_fg_color;
  }
}

.warning {
  @extend %color_infobar;
  background-color: $warning_color;

  &:backdrop {
    background-color:lighten($warning_color,10%);
    color: $backdrop_selected_fg_color;
  }
}

.question {
  @extend %color_infobar;
  background-color: $question_color;

  &:backdrop {
    background-color:lighten($question_color,10%);
    color: $backdrop_selected_fg_color;
  }

}

.error {
  @extend %color_infobar;
  background-color: $error_color;

  &:backdrop {
    background-color:lighten($error_color,10%);
    color: $backdrop_selected_fg_color;
  }
}