Update network colours for better accessibility. (#3469)

ui/app/components/dropdowns/network-dropdown.js

@@ -114,7 +114,7 @@ NetworkDropdown.prototype.render = function () {
       [
         providerType === 'mainnet' ? h('i.fa.fa-check') : h('.network-check__transparent', '✓'),
         h(NetworkDropdownIcon, {
-          backgroundColor: '#038789', // $blue-lagoon
+          backgroundColor: '#29B6AF', // $java
           isSelected: providerType === 'mainnet',
         }),
         h('span.network-name-item', {
@@ -136,7 +136,7 @@ NetworkDropdown.prototype.render = function () {
       [
         providerType === 'ropsten' ? h('i.fa.fa-check') : h('.network-check__transparent', '✓'),
         h(NetworkDropdownIcon, {
-          backgroundColor: '#e91550', // $crimson
+          backgroundColor: '#ff4a8d', // $wild-strawberry
           isSelected: providerType === 'ropsten',
         }),
         h('span.network-name-item', {
@@ -158,7 +158,7 @@ NetworkDropdown.prototype.render = function () {
       [
         providerType === 'kovan' ? h('i.fa.fa-check') : h('.network-check__transparent', '✓'),
         h(NetworkDropdownIcon, {
-          backgroundColor: '#690496', // $purple
+          backgroundColor: '#7057ff', // $cornflower-blue
           isSelected: providerType === 'kovan',
         }),
         h('span.network-name-item', {
@@ -180,7 +180,7 @@ NetworkDropdown.prototype.render = function () {
       [
         providerType === 'rinkeby' ? h('i.fa.fa-check') : h('.network-check__transparent', '✓'),
         h(NetworkDropdownIcon, {
-          backgroundColor: '#ebb33f', // $tulip-tree
+          backgroundColor: '#f6c343', // $saffron
           isSelected: providerType === 'rinkeby',
         }),
         h('span.network-name-item', {

ui/app/css/itcss/settings/variables.scss

@@ -46,6 +46,10 @@ $manatee: #93949d;
 $spindle: #c7ddec;
 $mid-gray: #5b5d67;
 $cape-cod: #38393a;
+$java: #29b6af;
+$wild-strawberry: #ff4a8d;
+$cornflower-blue: #7057ff;
+$saffron: #f6c343;
 
 /*
   Z-Indicies