diff --git a/README.md b/README.md
index 917be293303..2a6f2b09c36 100644
--- a/README.md
+++ b/README.md
@@ -481,9 +481,9 @@ To learn more about the Nightscout API, visit https://YOUR-SITE.com/api-docs/ or
   * `OPENAPS_URGENT` (`60`) - The number of minutes since the last loop that needs to be exceed before an urgent alarm is triggered
   * `OPENAPS_FIELDS` (`status-symbol status-label iob meal-assist rssi`) - The fields to display by default.  Any of the following fields: `status-symbol`, `status-label`, `iob`, `meal-assist`, `freq`, and `rssi`
   * `OPENAPS_RETRO_FIELDS` (`status-symbol status-label iob meal-assist rssi`) - The fields to display in retro mode. Any of the above fields.
-  * `OPENAPS_PRED_IOB_COLOR` (`#1e88e5`) - The color to use for IOB prediction lines. Colors can be in either `#RRGGBB` or `#RRGGBBAA` format.
-  * `OPENAPS_PRED_COB_COLOR` (`#FB8C00FF`) - The color to use for COB prediction lines. Same format as above.
-  * `OPENAPS_PRED_ACOB_COLOR` (`#FB8C0080`) - The color to use for ACOB prediction lines. Same format as above.
+  * `OPENAPS_PRED_IOB_COLOR` (`#1e88e5`) - The color to use for IOB prediction lines. Colors can be in `#RRGGBB` format, but [other CSS color units](https://www.w3.org/TR/css-color-3/#colorunits) may be used as well.
+  * `OPENAPS_PRED_COB_COLOR` (`#FB8C00`) - The color to use for COB prediction lines. Same format as above.
+  * `OPENAPS_PRED_ACOB_COLOR` (`#FB8C00`) - The color to use for ACOB prediction lines. Same format as above.
   * `OPENAPS_PRED_ZT_COLOR` (`#00d2d2`) - The color to use for ZT prediction lines. Same format as above.
   * `OPENAPS_PRED_UAM_COLOR` (`#c9bd60`) - The color to use for UAM prediction lines. Same format as above.
   * `OPENAPS_COLOR_PREDICTION_LINES` (`true`) - Enables / disables the colored lines vs the classic purple color.
diff --git a/lib/plugins/openaps.js b/lib/plugins/openaps.js
index a9c45db7e1b..cda93141481 100644
--- a/lib/plugins/openaps.js
+++ b/lib/plugins/openaps.js
@@ -54,8 +54,8 @@ function init (ctx) {
       , urgent: settings.urgent ? settings.urgent : 60
       , enableAlerts: settings.enableAlerts
       , predIOBColor: settings.predIobColor ? settings.predIobColor : '#1e88e5'
-      , predCOBColor: settings.predCobColor ? settings.predCobColor : '#FB8C00FF'
-      , predACOBColor: settings.predAcobColor ? settings.predAcobColor : '#FB8C0080'
+      , predCOBColor: settings.predCobColor ? settings.predCobColor : '#FB8C00'
+      , predACOBColor: settings.predAcobColor ? settings.predAcobColor : '#FB8C00'
       , predZTColor: settings.predZtColor ? settings.predZtColor : '#00d2d2'
       , predUAMColor: settings.predUamColor ? settings.predUamColor : '#c9bd60'
       , colorPredictionLines: settings.colorPredictionLines