A cobalt theme for Chrome Developer Tools inspired by Sublime Text 2 cobalt theme. Modifies the source code and other smaller tweaks.

Custom.css

/*
  
  Cobalt theme by Carlos Asín

  ************************************

  A cobalt theme for Chrome Developer Tools inspired by Sublime Text 2 cobalt theme. 

  Modifies the source code and other smaller tweaks.

  Tested on PC and Mac.

  Have plans to convert the other panes at some point. Let me know if you find issues with it

  Installation:

  Simply override Custom.css in the User Stylesheets directory:

  Mac: ~/Library/Application Support/Google/Chrome/Default/User StyleSheets/Custom.css

  Mac (Canary): 
    ~/Library/Application Support/Google/Chrome Canary/Default/User StyleSheets/Custom.css

  PC: C:\Users\YourUsername\AppData\Local\Google\Chrome\UserData\Default\User StyleSheets\Custom.css

  PC (Canary): 
    C:\Users\YourUsername\AppData\Local\Google\Chrome SxS\UserData\Default\User StyleSheets\Custom.css

  Ubuntu (Chromium): ~/.config/chromium/Default/User StyleSheets/Custom.css

  Screenshoot:

  https://googledrive.com/host/0BwzDh0DsxCXlS3g5TF9kS1BDWHM/chrome-cobalt-theme/cobalt-theme.png

*/

/**********************************************/
/* View Source
/**********************************************/

.webkit-line-number {
  background: #3A312C !important;
}

.webkit-line-content {
  background: #002240 !important;
  color: #BDAE9D !important;
}

/**********************************************/
/* Elements
/**********************************************/

  /**********************************************/
  /* Layout
  /**********************************************/

  #storage-views .script-view,
  #network-views .script-view,
  #script-resource-views .script-view {
    color: #BDAE9D !important;
  }
  
  #storage-views .script-view,
  #elements-content,
  #network-views .text-editor-contents,
  #script-resource-views .script-view {
    background: #002240 !important;
    font-size: 12px !important;
  }
  
  #elements-content .highlight { 
    color: #f1f1f1;
  }
  
  #elements-content li.hovered:not(.selected) .selection {
    background: rgba(255, 255, 255, .2) !important;
  }

  #elements-content .selection.selected {
    z-index: 0 !important;
  }

  #elements-content ol:focus li.selected .selection {
    background: #4A412C !important;
  }

  #elements-content .selected .highlight {
    position: relative;
    z-index: 2;
  }
  
  #elements-content .selected {
    background-color: #4c4d5d !important;
  }
  
  #elements-content .editing {
    background-color: #242424 !important;
  }
  
  #elements-content .parent::before {
    content: url(chrome-devtools://devtools/Images/treeRightTriangleWhite.png) !important;
  }
  
  #elements-content .parent.expanded::before {
    content: url(chrome-devtools://devtools/Images/treeDownTriangleWhite.png) !important;
  }
  
  /**********************************************/
  /* HTML
  /**********************************************/

  .webkit-html-comment{
    font-style: italic; color: #007fef !important;
  }

  .webkit-html-tag {
    color: #8ae4e7 !important;
  }
  
  .webkit-html-attribute-name {
    color: #8ae4e7 !important;
  }

  .webkit-html-attribute-value {
    color: #39d700 !important;
  }
  
  /**********************************************/
  /* CSS
  /**********************************************/
  
  .styles-section {
    background: #002240 !important;
    color: white;
  }

  .webkit-css-comment {
    font-style: italic; color: #007fef !important;
  }

  .webkit-css-selector, .styles-selector,
  .styles-section .selector-matches {
    color: #59d95f !important;
  }

  .styles-section .selector {
    color: #8ce5e9 !important;
  }

  .webkit-css-property {
    color: #9bf09d !important;
  }

  .webkit-css-keyword {
    color: #edf080 !important;
  }

  .webkit-css-number,
  .properties-tree .value {
    color: #eaed7f !important;
  }

  .webkit-css-important,
  .webkit-css-at-rule {
    color: white !important;
  }

  .webkit-css-string {
    color: #3ad900 !important;
  }

  /**********************************************/
  /* JavaScript
  /**********************************************/
  
  .webkit-javascript-ident {
    color: #e28f07 !important;
  }

  .webkit-javascript-keyword {
    color: #edf080 !important;
  }
  
  .webkit-javascript-comment {
    font-style: italic; color: #007fef !important;
  }
  
  .webkit-javascript-string {
    color:#31bd09 !important;
  }
  
  .webkit-javascript-number {
    color: #e59097 !important;
  }
  
  .webkit-javascript-regexp {
    color: white !important;
  }