fix: tackle fallout from lifting a handful of dislocated changes

bigbluebutton-html5/imports/ui/components/actions-bar/styles.scss

@@ -59,6 +59,7 @@
 }
 
 .offsetBottom {
+  position: relative
   :global(.MuiPaper-root) {
     top: auto !important;
     bottom: 4rem !important;

bigbluebutton-html5/imports/ui/components/button/styles.scss

@@ -248,7 +248,6 @@
     top: 0;
     height: 60%;
     left: 0;
-    width: 75%;
     margin-left: 25%;
     font-size: 50%;
     margin-top: 40%;

bigbluebutton-html5/imports/ui/components/video-provider/video-button/component.jsx

@@ -59,6 +59,7 @@ const JoinVideoButton = ({
 }) => {
   const { isMobile } = deviceInfo;
   const shouldEnableWebcamSelectorButton = ENABLE_WEBCAM_SELECTOR_BUTTON
+    && hasVideoStream
     && !isMobile;
   const exitVideo = () => hasVideoStream
     && !isMobile
@@ -93,7 +94,6 @@ const JoinVideoButton = ({
       <ButtonEmoji
         onClick={handleOpenAdvancedOptions}
         emoji="device_list_selector"
-        hidden={!hasVideoStream}
         hideLabel
         label={intl.formatMessage(intlMessages.advancedVideo)}
       />