gnome-shell-dark-theme/gnome-shell-sass/widgets/_dialogs.scss

/* Modal Dialogs */

// style for all dialogs
.modal-dialog {
  background-color: $bg_color;
  border-radius: $alert_radius;
  padding: $base_padding * 4;
  spacing: $base_padding * 3;
  box-shadow: 0 12px 8px 12px rgba(0,0,0,0.03);

  .modal-dialog-content-box {
    padding-top: $base_padding * 2;
    spacing: $base_padding * 3;
    max-width: 28em;
  }

  .modal-dialog-button-box {
    padding-top: $base_padding;
    .modal-dialog-button {
      @extend %dialog_button;
    }
  }
}

// lists in dialogs
.dialog-list {
  spacing: $base_padding * 3;

  .dialog-list-title {
    @extend %heading;
    text-align: center;
  }

  .dialog-list-scrollview { max-height: 200px; }
  .dialog-list-box {
    spacing: 1em;

    .dialog-list-item {
      spacing: 1em;

      .dialog-list-item-title { font-weight: bold; }
      .dialog-list-item-description {
        @extend %caption;
        color: darken($fg_color,5%);
      }
    }
  }
}

/* End Session Dialog */
.end-session-dialog {
  width: 24em;

  // special style for session warnings
  .end-session-dialog-battery-warning,
  .dialog-list-title {
    color: $warning_color;
    background-color: transparentize($warning_color, 0.9);
    padding: $base_padding * 1.5;
    border-radius: $base_border_radius;
    margin: $base_margin 0;
  }
}

/* Message Dialog */
.message-dialog-content {
  spacing: $base_padding * 3;

  .message-dialog-title {
    text-align: center;
    @extend %title_2;

    &.lightweight {
      @extend %title_4;
    }
  }
  .message-dialog-description {
    text-align: center;
  }
}

/* Run Dialog */
.run-dialog {
  width: 24em;

  // run dialog needs to override bottom padding
  // to account for inexplicable extra padding
  padding-bottom: $base_padding;

  .run-dialog-entry {
    padding: $base_padding * 2 $base_padding * 1.5;
  }
  .run-dialog-description {
    @extend %caption;
    color: darken($fg_color, 20%);
  }
}

/* Password or Authentication Dialog */
.prompt-dialog {
  width: 28em;

  .prompt-dialog-password-grid {
    spacing-rows: $base_margin * 2;
    spacing-columns: $base_margin;

    .prompt-dialog-password-entry {
      width: auto;
      // 4px (spacing) + 16px (spinner-width)
      &:ltr { margin-left: $base_margin+$base_icon_size; }
      &:rtl { margin-right: $base_margin+$base_icon_size; }
    }
  }

  .prompt-dialog-password-layout {
    spacing: $base_margin * 2;
  }

  .prompt-dialog-password-entry {
    width: 20em;
    padding: $base_padding * 2 $base_padding * 1.5;
  }

  .prompt-dialog-error-label,
  .prompt-dialog-info-label,
  .prompt-dialog-null-label {
    @extend %caption;
    text-align: center;
  }

  .prompt-dialog-error-label {
    color: $warning_color;
  }
}

/* Polkit Dialog */
.polkit-dialog-user-layout {
  text-align: center;
  spacing: $base_margin * 2;
  margin-bottom: $base_padding;

  .polkit-dialog-user-label,
  .polkit-dialog-user-root-label {
    @extend %title_4;
  }

  .polkit-dialog-user-root-label {
    color: $warning_color;
  }
}

/* Audio selection dialog */
.audio-device-selection-dialog {
  min-width: 24em;

  .audio-selection-box {
    spacing: $base_padding * 2;

    // styled similar to switcher-popup
    .audio-selection-device {
      @include tile_button($fg:$fg_color, $bg:$bg_color, $system:false);

      .audio-selection-device-box {
        padding: $base_padding * 2;
        spacing: $base_padding * 2;
      }

      .audio-selection-device-icon {
        icon-size: $base_icon_size * 4;
      }
    }
  }
}

/* Welcome dialog */
.welcome-dialog-image {
  background-image: url("resource:///org/gnome/shell/theme/gnome-shell-start.svg");
  background-size: contain;
  /* Reasonable maximum dimensions */
  height: 300px;
  width: 300px;
}

/* Access portal dialog */
.access-dialog {
  text-align: center;
}

// specific label style for restart message
.restart-message {
  @extend %title_4;
}