diff --git a/files/default-dark.css b/files/default-dark.css
new file mode 100644
index 0000000..8a4e207
--- /dev/null
+++ b/files/default-dark.css
@@ -0,0 +1,23 @@
+.navbar {
+  color: #e8e6e3;
+  background-color: #262a2b;
+}
+
+.navbar li a {
+  color: #e8e6e3;
+}
+
+/* Change the link color on hover */
+.navbar li a:hover {
+  background-color: #0d0e0e;
+}
+
+.license {
+  color: #e8e6e3;
+  background-color: #313537;
+}
+
+body {
+  color: #e8e6e3;
+  background-color: #181a1b;
+}
\ No newline at end of file
diff --git a/files/default.css b/files/default.css
new file mode 100644
index 0000000..1006681
--- /dev/null
+++ b/files/default.css
@@ -0,0 +1,22 @@
+.navbar {
+  color: #fff;
+  background-color: #333;
+}
+
+.navbar li a {
+  color: #fff;
+}
+
+/* Change the link color on hover */
+.navbar li a:hover {
+  background-color: #111;
+}
+
+.license {
+  color: #000;
+  background-color: #ddd;
+}
+
+body {
+  background-color: #fff;
+}
\ No newline at end of file
diff --git a/files/global.css b/files/global.css
index 9f1300a..9e31819 100644
--- a/files/global.css
+++ b/files/global.css
@@ -7,6 +7,7 @@ body {
   margin-top: 32px;
   margin-bottom: 56px;
   font-family: Arial;
+  height: 100%;
 }
 
 .folders {
@@ -129,7 +130,6 @@ figure {
 .caption {
   padding-top: 4px;
   text-align: center;
-  font-style: italic;
   font-size: 12px;
   width: 100%;
   display: block;
@@ -139,7 +139,6 @@ figure {
   position: fixed;
   bottom: 0;
   width: 100%;
-  background-color: lightgrey;
   padding: 12px;
 }
 
@@ -151,7 +150,6 @@ figure {
   position: fixed;
   top: 0;
   width: 100%;
-  background-color: #333;
 }
 
 .navbar li {
@@ -160,7 +158,6 @@ figure {
 
 .navbar li a {
   display: block;
-  color: white;
   text-align: center;
   padding: 14px 16px;
   text-decoration: none;
@@ -168,13 +165,7 @@ figure {
 
 .navbar li span {
   display: block;
-  color: white;
   text-align: center;
   padding: 14px 16px;
   text-decoration: none;
-}
-
-/* Change the link color to #111 (black) on hover */
-.navbar li a:hover {
-  background-color: #111;
 }
\ No newline at end of file
diff --git a/files/monokai-vibrant.css b/files/monokai-vibrant.css
new file mode 100644
index 0000000..0647272
--- /dev/null
+++ b/files/monokai-vibrant.css
@@ -0,0 +1,30 @@
+.navbar {
+    font-weight: bold;
+    color: #f6f6f6;
+    background-color: #191b20;
+  }
+  
+  .navbar li a {
+    font-weight: bold;
+    color: #f6f6f6;
+  }
+  
+  /* Change the link color on hover */
+  .navbar li a:hover {
+    background-color: #2c313a;
+  }
+  
+  .license {
+    color: #f6f6f6;
+    background-color: #2c313a;
+  }
+  
+  body {
+    color: #f6f6f6;
+    background-color: #16171d
+  }
+
+  a {
+    font-weight: bold;
+    color: #ffd945;
+  }
\ No newline at end of file
diff --git a/generate_html.py b/generate_html.py
index a978af3..c377145 100755
--- a/generate_html.py
+++ b/generate_html.py
@@ -20,6 +20,7 @@ _ROOTTITLE = "Pictures"
 _STATICFILES = os.path.join(os.path.abspath(os.path.dirname(__file__)), "files")
 _FAVICON = ".static/favicon.ico"
 _STYLE = ".static/global.css"
+_THEME = ".static/default.css"
 _AUTHOR = "Author"
 # fmt: off
 rawext = [".3fr", ".ari", ".arw", ".bay", ".braw", ".crw", ".cr2", ".cr3", ".cap", ".data", ".dcs", ".dcr", ".dng", ".drf", ".eip", ".erf", ".fff", ".gpr", ".iiq", ".k25", ".kdc", ".mdc", ".mef", ".mos", ".mrw", ".nef", ".nrw", ".obm", ".orf", ".pef", ".ptx", ".pxn", ".r3d", ".raf", ".raw", ".rwl", ".rw2", ".rwz", ".sr2", ".srf", ".srw", ".tif", ".tiff", ".x3f"]
@@ -122,7 +123,7 @@ def listfolder(folder: str, title: str):
                 title=title,
                 favicon=f"{args.webroot}{_FAVICON}",
                 stylesheet=f"{args.webroot}{_STYLE}",
-                theme=None,
+                theme=f"{args.webroot}{urllib.parse.quote(args.theme)}",
                 root=args.webroot,
                 parent=parent,
                 header=header,
@@ -179,6 +180,7 @@ def main():
     parser.add_argument("-l", "--license", help="License", default=None, required=False, choices=["cc-zero", "cc-by", "cc-by-sa", "cc-by-nd", "cc-by-nc", "cc-by-nc-sa", "cc-by-nc-nd"], dest="license")
     parser.add_argument("-a", "--author", help="Author", default=_AUTHOR, required=False, type=str, dest="author")
     parser.add_argument("-t", "--title", help="Title", default=_ROOTTITLE, required=False, type=str, dest="title")
+    parser.add_argument("--theme", help="Relative link to CSS theme file", default=_THEME, required=False, type=str, dest="theme")
     parser.add_argument("--fancyfolders", help="Use fancy folders instead of default apache ones", action="store_true", default=False, required=False, dest="fancyfolders")
     args = parser.parse_args()
     # fmt: on