KdanLoginRegisterUI/src/main/res/layout/btn_email_login_register.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="@dimen/login_register_btn_height"
    android:background="@drawable/bg_email_btn"
    >

    <ImageView
        android:id="@+id/iv_emailLoginRegisterBtn_ic"
        android:src="@drawable/btn_icon_mail"
        android:scaleType="centerCrop"
        android:contentDescription="@string/emptyImageContextDescription"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_margin="1dp"
        app:layout_constraintDimensionRatio="1:1"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        />

    <TextView
        android:id="@+id/tv_emailLoginRegisterBtn_text"
        android:text="@string/signIn_email"
        android:textColor="@color/kdan_blue"
        android:textSize="@dimen/login_register_text_size"
        android:fontFamily="@string/font_roboto_medium"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintLeft_toRightOf="@id/iv_emailLoginRegisterBtn_ic"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        />
</android.support.constraint.ConstraintLayout>