WhiteSur-gtk-theme/src/sass/gnome-shell/widgets-3-28/_app-grid.scss

$app_icon_size: 96px;

// App Vault/Grid
.icon-grid {
  spacing: 30px;
  -shell-grid-horizontal-item-size: 136px;
  -shell-grid-vertical-item-size: 136px;

  row-spacing: $container_padding * 6;
  column-spacing: $container_padding * 6;
  max-row-spacing: $container_padding * 12;
  max-column-spacing: $container_padding * 12;

  .overview-icon { icon-size: $app_icon_size; }
}

.app-folder-icon {
  padding: $container_padding;
  spacing-rows: $container_padding;
  spacing-columns: $container_padding;
}

// expanded folder
.app-folder-dialog {
  & .page-indicators {
    .page-indicator {
      padding: 15px 12px;
    }
  }

  & StButton#vhandle,
  & StButton#vhandle:hover,
  & StButton#vhandle:active { background-color: transparent; }
}

.page-indicator {
  padding: 15px 20px;

  .page-indicator-icon {
    width: 12px;
    height: 12px;
    border-radius: 12px;
    margin: 0;
    padding: 0;
    background-image: none;
    color: transparent;
    border: none;
    box-shadow: none;
    background-color: $light_alt_disabled_fg_color;
  }
  &:hover .page-indicator-icon {
    background-image: none;
    background-color: $light_disabled_fg_color;
  }
  &:active .page-indicator-icon {
    margin: 0;
    padding: 0;
    background-image: none;
    color: transparent;
    border: none;
    box-shadow: none;
    background-color: $light_alt_fg_color;
  }
  &:checked .page-indicator-icon {
    background-image: none;
    background-color: $light_alt_fg_color;
    transition-duration: 0ms;
  }
  &:checked:active { background-image: none; }
}