kmpdfkit_demo/compdfkit-tools/src/main/res/layout/tools_bookmark_input_dialog.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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_gravity="center"
    android:layout_height="wrap_content"
    xmlns:tools="http://schemas.android.com/tools"
    >

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="@dimen/tools_dialog_layout_width"
        android:paddingHorizontal="16dp"
        android:paddingTop="16dp"
        android:paddingBottom="8dp"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        android:layout_height="wrap_content">



    <androidx.appcompat.widget.AppCompatEditText
        android:id="@+id/et_bookmark"
        android:layout_width="match_parent"
        android:maxLines="1"
        android:minHeight="45dp"
        android:hint="@string/tools_bookmark_title"
        android:gravity="center_vertical"
        android:paddingStart="8dp"
        android:layout_height="wrap_content"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="end"
        android:layout_marginTop="16dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@id/et_bookmark"
        android:orientation="horizontal">

        <Button
            android:id="@+id/btn_cancel"
            style="@style/tools_dialog_button_style"
            tools:textColor="@android:color/black"
            android:foreground="?android:attr/selectableItemBackground"
            android:text="@string/tools_common_cancel" />

        <Button
            android:id="@+id/btn_add"
            style="@style/tools_dialog_button_style"
            tools:textColor="@android:color/black"
            android:foreground="?android:attr/selectableItemBackground"
            android:text="@string/tools_common_okay" />

    </LinearLayout>


    </androidx.constraintlayout.widget.ConstraintLayout>

</androidx.constraintlayout.widget.ConstraintLayout>