main_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".MainActivity">

    <com.google.android.material.textfield.TextInputLayout
        android:id="@+id/tilFirstName"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:hintTextAppearance="@style/TextAppearence.TextInputLayout.">

        <EditText
            android:id="@+id/edtFirstName"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="First Name"
            android:inputType="text"
            android:singleLine="true" />
    </com.google.android.material.textfield.TextInputLayout>

    <com.google.android.material.textfield.TextInputLayout
        android:id="@+id/tilLastName"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:hintTextAppearance="@style/TextAppearence.TextInputLayout.Red">

        <EditText
            android:id="@+id/lastName"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="Last Name"
            android:inputType="text"
            android:singleLine="true" />
    </com.google.android.material.textfield.TextInputLayout>

    <com.google.android.material.textfield.TextInputLayout
        android:id="@+id/tilEmail"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:hintTextAppearance="@android:style/TextAppearance">

        <EditText
            android:id="@+id/mail"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="e-mail"
            android:inputType="textEmailAddress"
            android:singleLine="true" />
    </com.google.android.material.textfield.TextInputLayout>
</LinearLayout>