Disallow invalid inline style comments in stylesheets (#22930)

src/vector/jitsi/index.pcss

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-// TODO: Match the user's theme: https://github.com/vector-im/element-web/issues/12794
+/* TODO: Match the user's theme: https://github.com/vector-im/element-web/issues/12794 */
 
 @font-face {
     font-family: 'Nunito';
@@ -57,8 +57,8 @@ body, html {
     height: 100%;
     width: 100%;
 
-    // Hidden by default to avoid flashing the prejoin screen at the user when
-    // we're supposed to skip it anyways
+    /* Hidden by default to avoid flashing the prejoin screen at the user when */
+    /* we're supposed to skip it anyways */
     visibility: hidden;
 }
 
@@ -75,7 +75,7 @@ body, html {
 }
 
 #joinButton {
-    // A mix of AccessibleButton styles
+    /* A mix of AccessibleButton styles */
     cursor: pointer;
     padding: 7px 18px;
     text-align: center;
@@ -89,7 +89,7 @@ body, html {
 
 .icon {
     $icon-size: 42px;
-    margin-top: -$icon-size; // to visually center the form
+    margin-top: -$icon-size; /* to visually center the form */
 
     &::before {
         content: '';
@@ -102,7 +102,7 @@ body, html {
         display: block;
         width: $icon-size;
         height: $icon-size;
-        margin: 0 auto; // center
+        margin: 0 auto; /* center */
     }
 }