Pulse/app/src/main/res/layout/popup.xml

<?xml version="1.0" encoding="utf-8"?>
<com.google.android.material.card.MaterialCardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:cardCornerRadius="24dp"
    app:cardElevation="4dp"
    app:cardBackgroundColor="?attr/colorSurface">

    <TextView
        android:id="@+id/description"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="16dp"
        android:textColor="?attr/colorOnSurface"
        android:textSize="16sp"
        android:textAppearance="?attr/textAppearanceBodyMedium"
        android:textAlignment="center" />
</com.google.android.material.card.MaterialCardView>