Merge pull request #8 from OpenFreeEnergy/improve_contrast

switch from light grey to dark navy background for improved contrast

Author: jameseastwood

ofe_sphinx_theme/theme/ofe_sphinx_theme/sass/_colors.scss

@@ -69,8 +69,8 @@ html{
     --pst-color-shadow: #212121;
     --pst-color-border: silver;
     --pst-color-inline-code: var(--ofe-color-SergiosCousin);
-    --pst-color-target: var(--pst-color-info-highlight);;
-    --pst-color-background: var(--ofe-color-BeastlyLightGrey);
+    --pst-color-target: var(--pst-color-info-highlight);
+    --pst-color-background: #1d222d;
     --pst-color-on-background: #1e1e1e;
     --pst-color-surface: #666666;
     --pst-color-on-surface: #373737;