diff --git a/demo/theme.html b/demo/theme.html
index 60f36d6980de3f97e95f0777109f6de0a67f67b2..9194dcea8b8626e7fd162cea635737d901ec3258 100644
--- a/demo/theme.html
+++ b/demo/theme.html
@@ -16,6 +16,8 @@
 <link rel="stylesheet" href="../theme/cobalt.css">
 <link rel="stylesheet" href="../theme/colorforth.css">
 <link rel="stylesheet" href="../theme/dracula.css">
+<link rel="stylesheet" href="../theme/duotone-dark.css">
+<link rel="stylesheet" href="../theme/duotone-light.css">
 <link rel="stylesheet" href="../theme/eclipse.css">
 <link rel="stylesheet" href="../theme/elegant.css">
 <link rel="stylesheet" href="../theme/erlang-dark.css">
@@ -99,6 +101,8 @@ function findSequence(goal) {
     <option>cobalt</option>
     <option>colorforth</option>
     <option>dracula</option>
+    <option>duotone-dark</option>
+    <option>duotone-light</option>
     <option>eclipse</option>
     <option>elegant</option>
     <option>erlang-dark</option>
diff --git a/theme/duotone-dark.css b/theme/duotone-dark.css
new file mode 100644
index 0000000000000000000000000000000000000000..b09a585c97867305d9ea1e7fc9deb069cb2c46a7
--- /dev/null
+++ b/theme/duotone-dark.css
@@ -0,0 +1,35 @@
+/*
+Name:   DuoTone-Dark
+Author: by Bram de Haan, adapted from DuoTone themes by Simurai (http://simurai.com/projects/2016/01/01/duotone-themes)
+
+CodeMirror template by Jan T. Sott (https://github.com/idleberg), adapted by Bram de Haan (https://github.com/atelierbram/)
+*/
+
+.cm-s-duotone-dark.CodeMirror { background: #2a2734; color: #6c6783; }
+.cm-s-duotone-dark div.CodeMirror-selected { background: #545167!important; }
+.cm-s-duotone-dark .CodeMirror-gutters { background: #2a2734; border-right: 0px; }
+.cm-s-duotone-dark .CodeMirror-linenumber { color: #545167; }
+
+/* begin cursor */
+.cm-s-duotone-dark .CodeMirror-cursor { border-left: 1px solid #ffad5c; /* border-left: 1px solid #ffad5c80; */ border-right: .5em solid #ffad5c; /* border-right: .5em solid #ffad5c80; */ opacity: .5; }
+.cm-s-duotone-dark .CodeMirror-activeline-background { background: #363342; /* background: #36334280;  */ opacity: .5;}
+.cm-s-duotone-dark .cm-fat-cursor .CodeMirror-cursor { background: #ffad5c; /* background: #ffad5c80; */ opacity: .5;}
+/* end cursor */
+
+.cm-s-duotone-dark span.cm-atom, .cm-s-duotone-dark span.cm-number, .cm-s-duotone-dark span.cm-keyword, .cm-s-duotone-dark span.cm-variable, .cm-s-duotone-dark span.cm-attribute, .cm-s-duotone-dark span.cm-quote, .cm-s-duotone-dark span.cm-hr, .cm-s-duotone-dark span.cm-link { color: #ffcc99; }
+
+.cm-s-duotone-dark span.cm-property { color: #9a86fd; }
+.cm-s-duotone-dark span.cm-punctuation, .cm-s-duotone-dark span.cm-unit, .cm-s-duotone-dark span.cm-negative { color: #e09142; }
+.cm-s-duotone-dark span.cm-string { color: #ffb870; }
+.cm-s-duotone-dark span.cm-operator { color: #ffad5c; }
+.cm-s-duotone-dark span.cm-positive { color: #6a51e6; }
+
+.cm-s-duotone-dark span.cm-variable-2, .cm-s-duotone-dark span.cm-variable-3, .cm-s-duotone-dark span.cm-string-2, .cm-s-duotone-dark span.cm-url { color: #7a63ee; }
+.cm-s-duotone-dark span.cm-def, .cm-s-duotone-dark span.cm-tag, .cm-s-duotone-dark span.cm-builtin, .cm-s-duotone-dark span.cm-qualifier, .cm-s-duotone-dark span.cm-header, .cm-s-duotone-dark span.cm-em { color: #eeebff; }
+.cm-s-duotone-dark span.cm-bracket, .cm-s-duotone-dark span.cm-comment { color: #6c6783; }
+
+/* using #f00 red for errors, don't think any of the colorscheme variables will stand out enough, ... maybe by giving it a background-color ... */
+.cm-s-duotone-dark span.cm-error, .cm-s-duotone-dark span.cm-invalidchar { color: #f00; }
+
+.cm-s-duotone-dark span.cm-header { font-weight: normal; }
+.cm-s-duotone-dark .CodeMirror-matchingbracket { text-decoration: underline; color: #eeebff !important; } 
diff --git a/theme/duotone-light.css b/theme/duotone-light.css
new file mode 100644
index 0000000000000000000000000000000000000000..80203d15d9a6f62684fdc6a1eba0c6e666de2599
--- /dev/null
+++ b/theme/duotone-light.css
@@ -0,0 +1,36 @@
+/*
+Name:   DuoTone-Light
+Author: by Bram de Haan, adapted from DuoTone themes by Simurai (http://simurai.com/projects/2016/01/01/duotone-themes)
+
+CodeMirror template by Jan T. Sott (https://github.com/idleberg), adapted by Bram de Haan (https://github.com/atelierbram/)
+*/
+
+.cm-s-duotone-light.CodeMirror { background: #faf8f5; color: #b29762; }
+.cm-s-duotone-light div.CodeMirror-selected { background: #e3dcce !important; }
+.cm-s-duotone-light .CodeMirror-gutters { background: #faf8f5; border-right: 0px; }
+.cm-s-duotone-light .CodeMirror-linenumber { color: #cdc4b1; }
+
+/* begin cursor */
+.cm-s-duotone-light .CodeMirror-cursor { border-left: 1px solid #93abdc; /* border-left: 1px solid #93abdc80; */ border-right: .5em solid #93abdc; /* border-right: .5em solid #93abdc80; */ opacity: .5; }
+.cm-s-duotone-light .CodeMirror-activeline-background { background: #e3dcce;  /* background: #e3dcce80; */ opacity: .5; }
+.cm-s-duotone-light .cm-fat-cursor .CodeMirror-cursor { background: #93abdc; /* #93abdc80; */ opacity: .5; }
+/* end cursor */
+
+.cm-s-duotone-light span.cm-atom, .cm-s-duotone-light span.cm-number, .cm-s-duotone-light span.cm-keyword, .cm-s-duotone-light span.cm-variable, .cm-s-duotone-light span.cm-attribute, .cm-s-duotone-light span.cm-quote, .cm-s-duotone-light-light span.cm-hr, .cm-s-duotone-light-light span.cm-link { color: #063289; }
+
+.cm-s-duotone-light span.cm-property { color: #b29762; }
+.cm-s-duotone-light span.cm-punctuation, .cm-s-duotone-light span.cm-unit, .cm-s-duotone-light span.cm-negative { color: #063289; }
+.cm-s-duotone-light span.cm-string, .cm-s-duotone-light span.cm-operator { color: #1659df; }
+.cm-s-duotone-light span.cm-positive { color: #896724; }
+
+.cm-s-duotone-light span.cm-variable-2, .cm-s-duotone-light span.cm-variable-3, .cm-s-duotone-light span.cm-string-2, .cm-s-duotone-light span.cm-url { color: #896724; }
+.cm-s-duotone-light span.cm-def, .cm-s-duotone-light span.cm-tag, .cm-s-duotone-light span.cm-builtin, .cm-s-duotone-light span.cm-qualifier, .cm-s-duotone-light span.cm-header, .cm-s-duotone-light span.cm-em { color: #2d2006; }
+.cm-s-duotone-light span.cm-bracket, .cm-s-duotone-light span.cm-comment { color: #b6ad9a; }
+
+/* using #f00 red for errors, don't think any of the colorscheme variables will stand out enough, ... maybe by giving it a background-color ... */
+/* .cm-s-duotone-light span.cm-error { background: #896724; color: #728fcb; } */
+.cm-s-duotone-light span.cm-error, .cm-s-duotone-light span.cm-invalidchar { color: #f00; }
+
+.cm-s-duotone-light span.cm-header { font-weight: normal; }
+.cm-s-duotone-light .CodeMirror-matchingbracket { text-decoration: underline; color: #faf8f5 !important; }
+