Update variables

themes/_base.sass

@@ -1,3 +1,11 @@
+$dark-theme: false
+$light-theme: false
+$font-main: "Lora", sans-serif
+$font-monospace: "Inconsolata", monospace
+$color-text--light: lighten($color-text, 20%)
+$gap-l: 2.5rem
+$gap-m: 1rem
+
 body
   margin: $gap-l auto
   max-width: 700px
@@ -11,7 +19,6 @@ body
     color: $color-bg
     background: $color-selection
 
-
 h1, h2, h3
   font-family: $font-main,
   margin-top: $gap-l
@@ -31,26 +38,5 @@ a
 pre
   font-family: $font-monospace
 
-.isa_info, .isa_success, .isa_warning, .isa_error
-  width: 90%
-  margin: 10px 0px
-  padding: 12px
-
-.isa_info
-  color: #00529b
-  background-color: #bde5f8
-
-.isa_success
-  color: #4f8a10
-  background-color: #dff2bf
-
-.isa_warning
-  color: #9f6000
-  background-color: #feefb3
-
-.isa_error
-  color: #d8000c
-  background-color: #ffd2d2
-
 .timestamp
   color: $color-text--light

themes/dark.sass

@@ -1,11 +1,6 @@
-$font-main: "Lora", sans-serif
-$font-monospace: "Inconsolata", monospace
-$color-bg: #191919
-$color-text: #ffffffcf
-$color-text--light: lighten($color-text, 20%)
-$color-link: #6FB0E2
-$color-selection: #9BA6B0
-$gap-l: 2.5rem
-$gap-m: 1rem
-
-@use "base"
+@use 'base' with (
+  $color-bg: #191919
+  $color-text: #ffffffcf
+  $color-link: #6FB0E2
+  $color-selection: #9BA6B0
+)

themes/light.sass

@@ -1,11 +1,6 @@
-$font-main: "Lora", sans-serif
-$font-monospace: "Inconsolata", monospace
-$color-bg: #fffff5
-$color-text: #000
-$color-text--light: lighten($color-text, 20%)
-$color-link: #195880
-$color-selection: #4D5460
-$gap-l: 2.5rem
-$gap-m: 1rem
-
-@use "base"
+@use 'base' with (
+  $color-bg: #fffff5
+  $color-text: #000
+  $color-link: #195880
+  $color-selection: #4D5460
+)