Linux: ~./config/google-chrome/Default/User_StyleScheets/Custom.css; Mac: ~/Library/Application\ Support/Google/Chrome/Default/User\ StyleSheets/Custom.css

Custom.css

#console-messages .console-group-messages .section .header::before,
#console-messages .properties-tree li.parent::before 
{
  content: url(chrome-devtools://devtools/Images/treeRightTriangleWhite.png) !important;
}

#console-messages .console-group-messages .section.expanded .header::before,
#console-messages .properties-tree li.parent.expanded::before 
{
  content: url(chrome-devtools://devtools/Images/treeDownTriangleWhite.png) !important;
}

#elements-content .parent::before 
{
  content: url(chrome-devtools://devtools/Images/treeRightTriangleWhite.png) !important;
  position: relative;
  z-index: 999;
}

#elements-content .parent.expanded::before 
{
  content: url(chrome-devtools://devtools/Images/treeDownTriangleWhite.png) !important;
}

#elements-content .selected 
{
  background: #4A4B4B;
  border: 3px double black;
}

#elements-content .parent.selected + *
{
  background: #3A3B3B;
  border-left: 1px solid #DDD;
}

#elements-content.source-code 
{
  background: #22282A !important;
}

#elements-content .highlight { 
  color: #d4d4d4;
}

.webkit-html-tag,
.webkit-html-doctype,
.webkit-javascript-keyword
{
  color: #93C763 !important;
}

.webkit-html-attribute-name,
.webkit-css-selector 
{
  color: #268ba2 !important;
}

.webkit-html-attribute-value,
.webkit-javascript-string
{
  color: #C65618 !important;
}

.webkit-html-comment,
.webkit-javascript-comment,
.webkit-css-comment 
{
  color: #616F75 !important;
}

.webkit-css-important 
{
  color: #F1BD24 !important;
}

.webkit-css-property,
.webkit-css-at-rule 
{
  color: #7B7CA2 !important;
}

.webkit-javascript-ident 
{
  color: #d8d8d8 !important;
}

.webkit-html-text-node,
.webkit-html-css-node,
.webkit-html-js-node
{
  color: #d8d8d8!important;
}

/* Botoom and top */
#-webkit-web-inspector #toolbar {
  background-image: -webkit-linear-gradient(top, #93a1a1, #586e75) !important; 
  border-bottom: 1px solid #3D5B64 !important;

}
body#-webkit-web-inspector.dock-to-bottom.platform-mac #toolbar {
  border-top-color: #444 !important;
} 
#-webkit-web-inspector .toolbar-item { 
  letter-spacing: 0.1em !important;
} 
#-webkit-web-inspector .status-bar,
#-webkit-web-inspector .sidebar-tabbed-pane .tabbed-pane-header { 
  background-image: -webkit-linear-gradient(top, #839496,#425257) !important;
  border-top: 1px solid #002b36 !important;
} 
#-webkit-web-inspector button.status-bar-item {
  border-left: 1px solid rgba(0,0,0,.5) !important;
  border-right: 1px solid rgba(0,0,0,.5) !important;
} 
#-webkit-web-inspector #toolbar > button:hover .toolbar-label,
#-webkit-web-inspector .toolbar-item.toggleable.toggled-on .toolbar-label {
  color: #d7f8f8 !important; 
  cursor: pointer !important;
} 
#-webkit-web-inspector .status-bar .crumbs {
  text-shadow: none !important;
  color: #bbb !important;
} 
#-webkit-web-inspector .status-bar .crumbs .crumb {
  border-top: 2px solid #505050 !important;
  border-right: 1px solid #333 !important;
  border-left: 1px solid #666 !important;
  -webkit-border-image: none !important;
  padding: 0 10px !important;
  margin: 0 !important;
  line-height: 18px !important;
  -webkit-border-image: none !important;
} 
#-webkit-web-inspector .status-bar .crumbs .crumb:hover {
  color: #fff !important;
  cursor: pointer !important;
  border-top: 2px solid #00ffea !important; 
} 
#-webkit-web-inspector .status-bar .crumbs .crumb.selected {
  border-left: 1px solid rgba(0,0,0,0);
  border-right: 1px solid rgba(0,0,0,0);
  border-top: 2px solid #0095ff !important;
  background: #268bd2 !important;
  color: #ddd !important;
  cursor: default !important;
} 
#-webkit-web-inspector .status-bar .crumbs .crumb.selected:hover {
  color: #ddd !important;
}
#-webkit-web-inspector select.status-bar-item,
#-webkit-web-inspector select.status-bar-item:hover,
#-webkit-web-inspector .scope-bar li {  
  color: #AAA !important;
  text-shadow: none !important;
}
#-webkit-web-inspector select.status-bar-item,
#-webkit-web-inspector select.status-bar-item:hover {
  border-left: 1px solid #333 !important;
  border-right: 1px solid #333 !important;
}
/* Botoom and top */

/*CONSOLE*/
#-webkit-web-inspector #main { 
  background-color: #CFCFCF !important;
} 





/* Right menu bar */
.styles-section.matched-styles.monospace.first-styles-section.expanded {
  background-color: rgb(179, 225, 255);
}
.styles-section.matched-styles.monospace.first-styles-section.navigable.expanded {
   background-color: #FFF6C3;
}