diff --git a/Project.toml b/Project.toml
index 3e704acd..1097f2cc 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "Stipple"
 uuid = "4acbeb90-81a0-11ea-1966-bdaff8155998"
 authors = ["Adrian <e@essenciary.com>"]
-version = "0.27.14"
+version = "0.27.16"
 
 [deps]
 Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"
@@ -27,7 +27,7 @@ Tables = "bd369af6-aec1-5ad0-b16a-f7cc5008161c"
 DataFrames = "1"
 Dates = "1.6"
 FilePathsBase = "0.9"
-Genie = "5.20"
+Genie = "5.21.1"
 GenieSession = "1"
 GenieSessionFileSession = "1"
 JSON = "0.20, 0.21"
diff --git a/src/Layout.jl b/src/Layout.jl
index af9ea60a..e52a02cf 100644
--- a/src/Layout.jl
+++ b/src/Layout.jl
@@ -7,7 +7,7 @@ module Layout
 
 using Genie, Stipple
 
-export layout
+export layout, add_css, remove_css
 export page, app, row, column, cell, container, flexgrid_kwargs
 
 export theme
@@ -300,5 +300,47 @@ function theme(; core_theme::Bool = true) :: Vector{String}
   output
 end
 
+"""
+    add_css(css::Function; update = true)
+
+Add a css function to the `THEMES`.
+
+### Params
+* `css::Function` - a function that results in a vector of style elements
+* `update` - determines, whether existing style sheets with the same name shall be removed
+
+### Example
+```julia
+# css to remove the stipple-core color format of q-table rows
+# (this will enable font color setting by the attribute `table-class`)
+
+function mycss()
+  [
+    style(\"\"\"
+    .stipple-core .q-table tbody tr { color: inherit; }
+    \"\"\")
+  ]
+end
+
+add_css(mycss)
+```
+`
+"""
+function add_css(css::Function; update = true)
+  # removal can only be done by name, as the old function has already been overwritten
+  update && remove_css(css::Function, byname = true)
+  push!(Stipple.Layout.THEMES, css)
+end
+
+"""
+    remove_css(css::Function, byname::Bool = false)
+
+Remove a stylesheet function from the stack (`Stipple.Layout.THEMES`)
+If called with `byname = true`, the function will be identified by name rather than by the function itself.
+"""
+function remove_css(css::Function; byname::Bool = false)
+  inds = byname ? nameof.(Stipple.Layout.THEMES) .== nameof(css) : Stipple.Layout.THEMES .== css
+  deleteat!(Stipple.Layout.THEMES, inds)
+end
 
 end
diff --git a/src/Stipple.jl b/src/Stipple.jl
index d34440f1..a9fa4040 100644
--- a/src/Stipple.jl
+++ b/src/Stipple.jl
@@ -74,7 +74,7 @@ using Logging, Mixers, Random, Reexport, Dates, Tables
 @reexport using Observables
 @reexport @using_except Genie: download
 import Genie.Router.download
-@reexport @using_except Genie.Renderer.Html: mark, div, time, view, render, Headers
+@reexport @using_except Genie.Renderers.Html: mark, div, time, view, render, Headers, menu
 const htmldiv = Html.div
 export render, htmldiv, js_attr
 @reexport using JSON3
diff --git a/test/runtests.jl b/test/runtests.jl
index 808ebf93..a2c932b5 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -394,4 +394,25 @@ end
     @test df[end, 1] == 3
     @test df[end, end] == 14
     @test df[:, end] == 12:14
+end
+
+@testset "adding and removing stylesheets" begin
+    function my_css()
+        [style("""
+            .stipple-core .q-table tbody tr { color: inherit; }
+        """)]
+    end
+
+    add_css(my_css)
+    @test Stipple.Layout.THEMES[end] == my_css
+    
+    n = length(Stipple.Layout.THEMES)
+    remove_css(my_css)
+    @test length(Stipple.Layout.THEMES) == n - 1
+    @test findfirst(==(my_css), Stipple.Layout.THEMES) === nothing
+    
+    add_css(my_css)
+    @test Stipple.Layout.THEMES[end] == my_css
+    remove_css(my_css, byname = true)
+    @test findfirst(==(my_css), Stipple.Layout.THEMES) === nothing
 end
\ No newline at end of file