one-dark/cinnamon/sass/ui/workspace.scss

//
// Overview
//
#overview {
  spacing: 12px;
}

.window-caption {
  background-color: $osd_bg_color;
  border: 1px solid $osd_bg_color;
  color: $osd_fg_color;
  spacing: 8px;
  border-radius: 2px;
  font-size: 0.9em;
  padding: 5px 8px;
  -cinnamon-caption-spacing: 8px;

  &:focus {
    background-color: $selected_bg_color;
    color: $selected_fg_color;
    border: 1px solid $selected_bg_color;
  }
}

.window-border {
  border: 3px $selected_bg_color;
  border-radius: 2px;
  background-color: rgba(255, 255, 255, 0.05);
  /* Cover rounded corners and some bad adjustment gaps */
  box-shadow: 0 0 0 1px $selected_bg_color inset;
}

.overview-empty-placeholder {
  color: #ffffff;
  font-size: 2em;
}

.expo-workspaces-name-entry,
.expo-workspaces-name-entry#selected {
  height: 1.5em;
  border-radius: 2px;
  font-size: 1em;
  padding: 5px 8px;
  -cinnamon-caption-spacing: 4px;
  @include entry(osd);

  &:focus {
    border: 1px solid $selected_bg_color;
    background-color: $selected_bg_color;
    color: $selected_fg_color;
    font-style: italic;
    transition-duration: 300;
    selection-background-color: $selected_fg_color;
    selected-color: $selected_bg_color;
  }
}

.expo-workspace-thumbnail-frame {
  border: 4px solid rgba(255, 255, 255, 0);
  background-color: rgba(255, 255, 255, 0);
  border-radius: 2px;

  &#active {
    border: 4px solid $selected_bg_color;
    background-color: black;
    border-radius: 2px;
  }
}

.expo-background {
  background-color: opacify($osd_bg_color, 1);
}

.workspace {
  //&-controls { visible-height: 32px; }

  &-thumbnails {
    spacing: 26px;

    &-background,
    &-background:rtl {
      padding: 8px;
    }
  }

  &-add-button {
    background-image: url('common-assets/misc/add-workspace.svg');
    height: 200px;
    width: 35px;
    transition-duration: 100;

    &:hover {
      background-image: url('common-assets/misc/add-workspace-hover.svg');
      transition-duration: 100;
    }
    &:active {
      background-image: url('common-assets/misc/add-workspace-active.svg');
      transition-duration: 100;
    }
  }
  &-overview-background-shade {
    background-color: rgba(0, 0, 0, 0.5);
  }
}

.workspace-close-button,
.window-close {
  background-image: url('common-assets/misc/close.svg');
  background-size: 26px;
  height: 26px;
  width: 26px;
  -cinnamon-close-overlap: 12px;

  &:hover {
    background-image: url('common-assets/misc/close-hover.svg');
    background-size: 26px;
    height: 26px;
    width: 26px;
  }
  &:active {
    background-image: url('common-assets/misc/close-active.svg');
    background-size: 26px;
    height: 26px;
    width: 26px;
  }
}

//.workspace-thumbnail-indicator {
//  outline: 2px solid red;
//  border: 1px solid green;
//}
//
//.window-close:rtl {
//  -st-background-image-shadow: 2px 2px 6px rgba(0,0,0,0.5);
//}

.window-close-area {
  background-image: url('common-assets/misc/trash-icon.svg');
  height: 120px;
  width: 400px;
}

//
// Workspace Switcher applet (workspaceSwitcher.js)
//
#workspaceSwitcher {
  spacing: 0px;
  padding: 3px;
}

/* Controls the styling when using the "Simple buttons" option */
.workspace-switcher {
  padding-left: 3px;
  padding-right: 3px;

  .panel-left &,
  .panel-right & {
    padding: 0;
  }
}

.workspace-button {
  border: 1px solid transparentize(black, 0.6);
  background-color: transparentize(black, 0.8);
  width: 20px;
  height: 14px;
  color: transparentize($selected_fg_color, 0.55);
  padding: 3px;
  padding-top: 4px;
  transition-duration: 200;

  &.vertical {
    height: 1.5em;
    width: 24px;
    padding: 0;
    padding-top: 3px;
    padding-bottom: 3px;
  }

  &:outlined {
    background-color: $selected_bg_color;
    color: $selected_fg_color;

    &:hover {
      background-color: transparentize($selected_bg_color, 0.3);
      color: $selected_fg_color;
    }
  }

  &:hover {
    background-color: transparentize($fg_color, 0.8);
    color: $selected_fg_color;
  }
}

/* Controls the style when using the "Visual representation" option */
.workspace-graph {
  padding: 3px;
  spacing: 6px;
}

.workspace-graph .workspace {
  border: 1px solid transparentize(black, 0.6);
  background-color: transparentize(black, 0.8);
}

.workspace-graph .workspace:active {
  border: 1px solid $selected_bg_color;
}

.workspace-graph .workspace .windows {
  -active-window-background: lighten($panel_bg, 15%);
  -active-window-border: rgba(0, 0, 0, 0.8);
  -inactive-window-background: lighten($panel_bg, 15%);
  -inactive-window-border: rgba(0, 0, 0, 0.8);
}

.workspace-graph .workspace:active .windows {
  -active-window-background: lighten($panel_bg, 25%);
  -active-window-border: rgba(0, 0, 0, 0.8);
  -inactive-window-background: lighten($panel_bg, 5%);
  -inactive-window-border: rgba(0, 0, 0, 0.8);
}