diff --git a/openflexure_microscope/api/static/src/assets/less/theme.less b/openflexure_microscope/api/static/src/assets/less/theme.less
index e3984a21..81c1f136 100644
--- a/openflexure_microscope/api/static/src/assets/less/theme.less
+++ b/openflexure_microscope/api/static/src/assets/less/theme.less
@@ -10,8 +10,8 @@
 // Colors
 //
 
-@global-color:                                  #666;
-@global-emphasis-color:                         #333;
+@global-color:                                  #000;
+@global-emphasis-color:                         #C32280;
 @global-muted-color:                            #666;
 
 @global-primary-background: #C32280;
@@ -33,7 +33,7 @@
 @global-medium-font-size: 20px;
 @global-small-font-size: 14px;
 
-@global-emphasis-color: #222;
+
 
 //
 // Base
diff --git a/openflexure_microscope/api/static/src/components/tabContentComponents/settingsComponents/featuresSettings.vue b/openflexure_microscope/api/static/src/components/tabContentComponents/settingsComponents/featuresSettings.vue
index 14636010..d707c56a 100644
--- a/openflexure_microscope/api/static/src/components/tabContentComponents/settingsComponents/featuresSettings.vue
+++ b/openflexure_microscope/api/static/src/components/tabContentComponents/settingsComponents/featuresSettings.vue
@@ -14,18 +14,21 @@
       for use in clinics acquiring blood smear samples using a 100x
       oil-immersion objective, with a Raspberry Pi Camera v2.
     </p>
-    <p class="uk-margin-small">
-      <label
-        ><input v-model="imjoyEnabled" class="uk-checkbox" type="checkbox" />
-        Enable ImJoy plugin engine</label
-      >
+    <p class="uk-margin-small" :class="{'uk-text-muted': !imjoyPermitted}">
+      <label :disabled="!imjoyPermitted">
+        <input v-model="imjoyEnabled" class="uk-checkbox" type="checkbox" :disabled="!imjoyPermitted"/>
+        Enable ImJoy plugin engine
+      </label>
     </p>
-    <p class="uk-margin-small">
+    <p class="uk-margin-small" v-if="imjoyPermitted">
       <a href="https://imjoy.io/">ImJoy</a> enables integration with a wide
       variety of microscopy and image analysis applications, including ImageJ.JS
       and Kaibu. Support for ImJoy within the OFM software is currently
       experimental, and it may slow down loading of the application.
     </p>
+    <p class="uk-margin-small uk-text-muted" v-if="!imjoyPermitted">
+      ImJoy plugins are disabled in this build of the OpenFlexure software.
+    </p>
     <p class="uk-margin-small">
       <label
         ><input v-model="galleryEnabled" class="uk-checkbox" type="checkbox" />
@@ -72,6 +75,12 @@ export default {
       set(value) {
         this.$store.commit("changeGalleryEnabled", value);
       }
+    },
+    imjoyPermitted: function () {
+      // ImJoy may be disabled using an environment variable.
+      // If this function returns false, it is never possible to
+      // use ImJoy, so we should gray out the option.
+      return process.env.VUE_APP_ENABLE_IMJOY === "true";
     }
   },