Tomorrow Theme for Chrome Developer Tools

Custom.less

/**********************************************/
/*
/* Tomorrow Skin by Ben Truyman - 2012
/*
/* Based on Chris Kempson's Tomorrow Theme:
/* https://github.com/ChrisKempson/Tomorrow-Theme
/*
/* Inspired by Darcy Clarke's blog post:
/* http://darcyclarke.me/design/skin-your-chrome-inspector/
/*
/**********************************************/

// globals
@background:   #1d1f21;
@current-line: #282a2e;
@selection:    #373b41;
@top-bar:      #C96666;
@foreground:   #c5c8c6;

// html
@html-attribute-name:  #C96666;
@html-attribute-value: #B5BC67;
@html-comment:         #7C7C7C;
@html-js-node:         #C2C3C3;
@html-link:            #EEC574;
@html-tag:             #C96666;
@html-text-node:       #C2C3C3;

// css
@css-comment:      #7C7C7C;
@css-keyword:      #DB925F;
@css-number:       #DB925F;
@css-property:     #EEC574;
@css-selector:     #C96666;
@css-special-rule: #B094BB;
@css-string:       #B5BC67;
@css-url:          #EEC574;

// javascript
@javascript-comment:        #7C7C7C;
@javascript-ident:          #FFFFFF;
@javascript-keyword:        #DB925F;
@javascript-number:         #DB925F;
@javascript-property-name:  #82A1BE;
@javascript-property-value: #C2C3C3;
@javascript-regexp:         #C96666;
@javascript-string:         #B5BC67;

#-webkit-web-inspector {
  
  ::selection {
    background: #888;
    opacity: 1;
  }
  
  /**********************************************/
  /* Toolbar
  /**********************************************/
  
  &.compact #toolbar {
    background-image: -webkit-linear-gradient(#555, #333) !important;
    border-bottom: 1px solid #444 !important;
    border-top: 5px solid @top-bar !important;
    padding-top: 0 !important;
    height: 50px !important;
  }
  
  &.compact #toolbar .toolbar-label {
    color: #aaa !important;
  }
  
  &.compact #toolbar .toggled-on .toolbar-label {
    color: #eee !important;
  }
  
  &.compact #toolbar .toolbar-item.toggleable.toggled-on {
    background-image: -webkit-linear-gradient(#333, #555) !important;
    padding-top: 10px !important;
    padding-bottom: 10px !important;
  }
  
  &.compact .toolbar-item.close-left {
    margin-top: 13px !important;
  }
  
  &.compact #toolbar-controls {
    margin-top: -5px !important;
  }
  
  &.compact #toolbar-search-item {
    margin-top: 12px !important;
  }
  
  &.compact #main {
    top: 50px !important;
  }
  
  &.compact #search-results-matches {
    color: #eee !important;
    text-shadow: none !important;
  }

  &.compact #search {
    background: @background !important;
  }
  
  /**********************************************/
  /* Console
  /**********************************************/
    
    /**********************************************/
    /* Messages
    /**********************************************/
    
    #console-messages {
      font-family: 'DroidSansMono', Menlo, monospace !important;
      background: @background
    }
    
    #console-messages a {
      color: #666 !important;
    }
    
    #console-messages a:hover {
      color: #999 !important;
    }
    
    .console-message {
      color: #F1F1F1 !important;
    }
    
    .console-message, .console-user-command {
      border-bottom: 1px solid #444 !important;
    }
    
    .console-user-command > .console-message-text {
      color: #C4C7C6 !important;
    }
    
    .console-formatted-number {
      color: @javascript-number !important;
    }
    
    .console-formatted-string {
      color: @javascript-string !important;
    }
    
    .console-formatted-object {
      color: #7C7C7C !important;
    }
    
    .console-formatted-function {
      color: @foreground !important;
    }
    
    .console-formatted-regexp {
      color: @javascript-regexp !important;
    }
    
    .console-group-messages .section .header .title {
      color: #F1F1F1 !important;
    }
    
    .console-group-messages .section .header::before,
    .properties-tree li.parent::before {
      content: url(chrome-devtools://devtools/Images/treeRightTriangleWhite.png) !important;
    }
    
    .console-group-messages .section.expanded .header::before,
    .properties-tree li.parent.expanded::before {
      content: url(chrome-devtools://devtools/Images/treeDownTriangleWhite.png) !important;
    }
    
    @-webkit-keyframes webkit-error-level {
      0%   { color: #f77 !important; }
      50%  { color: #f22 !important; }
      100% { color: #f77 !important; }
    }
    
    .console-message-text {
      color: @foreground;
    }
    
    .console-error-level .console-message-text .title {
      color: #f66 !important;
      -webkit-animation-name: webkit-error-level;
      -webkit-animation-duration: 2s;
      -webkit-animation-iteration-count: infinite;
      -webkit-timing-function: ease-in-out;
    }
    
    .console-user-command::before {
      background-image: url(data:image/png;base64,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) !important;
    }
    
    /**********************************************/
    /* Prompt
    /**********************************************/
    
    #console-prompt {
      color: #F1F1F1 !important;
    }
    
    #console-prompt::before {
      background-image: url(data:image/png;base64,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) !important;
      color: @foreground !important;
    }

  /**********************************************/
  /* Elements/Network/Scripts
  /**********************************************/

    /**********************************************/
    /* Layout
    /**********************************************/
    
    .script-view,
    .properties-tree,
    .pane,
    .breakpoint-list li,
    .pane > .body .info {
      color: #CCC !important;
    }
    
    .script-view,
    .text-editor-contents,
    .pane.expanded,
    #elements-content,
    .resource-view.json {
      background: @background !important;
      font-size: 12px !important;
    }
    
    .highlight {
      color: #F1F1F1;
    }
    
    li.hovered:not(.selected) .selection {
      background: rgba(255, 255, 255, .2) !important;
    }
    
    #elements-content .selected {
      background-color: @selection !important;
    }
    
    /**********************************************/
    /* HTML
    /**********************************************/
    
    .webkit-html-comment {
      color: @html-comment !important;
    }
    
    .webkit-html-tag {
      color: @html-tag !important;
    }
    
    .webkit-html-attribute-name {
      color: @html-attribute-name !important;
    }
    
    .webkit-html-attribute-value {
      color: @html-attribute-value !important;
    }
    
    .webkit-html-text-node
    .webkit-html-css-node {
      color: @html-text-node !important;
    }
    
    .webkit-html-js-node {
      color: @html-js-node !important;
    }
    
    .webkit-html-resource-link,
    .webkit-html-external-link {
      color: @html-link !important;
    }
    
    /**********************************************/
    /* CSS
    /**********************************************/
    
    .webkit-css-comment {
      color: @css-comment !important;
    }
    
    .webkit-css-selector,
    .styles-selector {
      color: @css-selector !important;
    }
    
    .webkit-css-property {
      color: @css-property !important;
    }
    
    .webkit-css-keyword {
      color: @css-keyword !important;
    }
    
    .webkit-css-number,
    .properties-tree .value {
      color: @css-number !important;
    }
    
    .webkit-css-important,
    .webkit-css-at-rule {
      color: @css-special-rule !important;
    }
    
    .webkit-css-string {
      color: @css-string !important;
    }
    
    .webkit-css-url {
      color: @css-url !important;
    }
    
    /**********************************************/
    /* JavaScript
    /**********************************************/
    
    .webkit-line-content,
    .webkit-javascript-ident {
      color: @javascript-ident !important;
    }
    
    .webkit-javascript-keyword {
      color: @javascript-keyword !important;
    }
    
    .webkit-javascript-comment {
      color: @javascript-comment !important;
    }
    
    .webkit-javascript-string {
      color: @javascript-string !important;
    }
    
    .webkit-javascript-number {
      color: @javascript-number !important;
    }
    
    .webkit-javascript-regexp {
      color: @javascript-regexp !important;
    }
    
    .section .properties .name,
    .event-properties .name {
      color: @javascript-property-name !important;
    }
    
    /**********************************************/
    /* Everything Else
    /**********************************************/
    
    .editing {
      color: @foreground !important;
      background-color: #000 !important;
    }
    
    .styles-section.read-only {
      background: @selection !important;
    }
    
    .styles-section,
    .subtitle {
      color: #7C7C7C !important;
    }
    
    .styles-sidebar-separator,
    .pane > .title {
      background-image: -webkit-linear-gradient(#555, #333) !important;
      border-top-color: #666 !important;
      border-bottom-color: #333 !important;
      color: #bbb !important;
      text-shadow: black 0 1px 0 !important;
      text-overflow: ellipsis !important;
    }
    
    .pane > .title > button,
    .pane > .title > select {
      -webkit-filter: invert(1);
    }
    
    .split-view-sidebar-right {
      background: #222 !important;
    }
    
    .section > .header::before,
    .properties-tree li.parent::before,
    .event-bars .event-bar .header::before,
    .outline-disclosure li.parent::before,
    .styles-section.matched-styles .properties li.parent .expand-element {
      content: url(chrome-devtools://devtools/Images/treeRightTriangleWhite.png) !important;
    }
    
    .styles-section .properties li.parent::before,
    .styles-section .properties li.parent.expanded::before {
      content: none !important;
    }
    
    .styles-section.matched-styles .properties li.parent .expand-element {
      margin-right: 1px !important;
      margin-left: -5px !important;
      opacity: 0.6 !important;
    }
    
    .section.expanded > .header::before,
    .properties-tree li.parent.expanded::before,
    .event-bars .event-bar.expanded .header::before,
    .outline-disclosure li.parent.expanded::before,
    .styles-section.matched-styles .properties li.parent.expanded .expand-element {
      content: url(chrome-devtools://devtools/Images/treeDownTriangleWhite.png) !important;
    }
    
    .child-editing {
      color: @foreground !important;
    }
    
    .section .properties .name,
    .event-properties .name {
      color: @javascript-property-name !important;
    }
    
    .styles-selector {
      color: @css-selector !important;
    }
    
    .section .header {
      color: #CCC !important;
    }
    
    .properties .value {
      color: @javascript-property-value !important;
    }
    
    .metrics {
      color: #333 !important;
    }
    
    .metrics .border {
      border-color: #FFF !important;
    }
    
    .event-bars .event-bar .header .title {
      color: #969796 !important;
      text-shadow: none !important;
    }
    
    .console-formatted-number {
      color: @javascript-number !important;
    }
    
    .console-formatted-string {
      color: @javascript-string !important;
    }
    
    .console-formatted-object,
    .console-formatted-node,
    .console-formatted-array {
      color: #7C7C7C !important;
    }
    
    .console-formatted-function {
      color: @foreground !important;
    }
    
    .console-formatted-regexp {
      color: @javascript-regexp !important;
    }
    
    .styles-element-state-pane {
      background: @selection !important;
    }
    
    .placard:nth-of-type(2n) {
      background: #333 !important;
    }
    
    .placard.selected {
      background-image: -webkit-linear-gradient(@top-bar, darken(@top-bar, 30%)) !important;
      border-top-color: darken(@top-bar, 30%) !important;
    }
    
    .placard .title {
      color: #CCC !important;
    }
    
    .placard .subtitle {
      color: rgba(255, 255, 255, 0.7) !important;
    }
    
    .popover {
      background-color: rgba(0, 0, 0, 0.9) !important;
      border: 10px solid rgba(0, 0, 0, 0.9) !important;
      border-radius: 10px !important;
      -webkit-border-image: none !important;
      // margin-top: -15px !important;
      margin-left: 10px !important;
    }
    
    .popover .arrow {
      background-image: none !important;
      border-color: transparent transparent #000 transparent !important;
      border-style: solid;
      border-width: 10px;
      width: 0 !important;
      height: 0 !important;
      bottom: -2px !important;
      left: 0;
    }
    
    .popover.bottom-left-arrow .arrow,
    .popover.bottom-right-arrow .arrow {
      border-color: #000 transparent transparent transparent !important;
    }

    .popover.left-top-arrow .arrow,
    .popover.left-bottom-arrow .arrow {
      border-color: transparent #000 transparent transparent !important;
    }

    .popover.right-top-arrow .arrow,
    .popover.right-bottom-arrow .arrow {
      border-color: transparent transparent #000 transparent !important;
    }
    
    .popover .source-frame-popover-title {
      color: @foreground !important;
    }
    
    .popover .source-frame-popover-tree {
      border-top-color: #444 !important;
    }
    
    .custom-popup-vertical-scroll ::-webkit-scrollbar-track-piece:vertical:decrement,
    .custom-popup-vertical-scroll ::-webkit-scrollbar-track-piece:vertical:increment {
        background: #333 !important;
        border-radius: 5px !important;
    }
    
    .webkit-execution-line.webkit-line-content {
      background-color: @selection !important;
      outline: 1px solid darken(@selection, 15%) !important;
    }
}

Requires LESS compiler:

npm install less

To install:

curl -s https://raw.github.com/gist/3040634/52b0cf0d952fc89dd1bcaef49febf63fc11f1850/Custom.less 2>&1 | lessc - > ~/Library/Application\ Support/Google/Chrome/Default/User\ StyleSheets/Custom.css

Thank you.
Call stack in script panel is unreadable. fix:

.placard .title {
color: white;
}
.selected.placed .title {
color: black;
}

When hover over functions in script panel, text content of popup is white on yellow that is unreadable.
This will fix it:

#-webkit-web-inspector .popover .console-formatted-function{
  color: #333 !important;
}

Added a bunch of minor tweaks/fixes. Thanks for your help @mohsen1.