TIL

<style name="TextInputStyle" parent="Widget.Design.TextInputLayout">
        <item name="android:theme">@style/TextInputLayoutTheme</item>
    </style>

    <style name="TextInputLayoutTheme">
        <item name="hintTextAppearance">@style/hint_text_input_layout</item>
        <item name="errorTextAppearance">@style/error_text_input_layout</item>
        <item name="android:textColor">@color/grey</item>
        <item name="android:textColorHint">@color/greyLight</item>
        <item name="colorControlNormal">@color/greyLight</item>
        <item name="colorControlActivated">@color/blue</item>
        <item name="colorControlHighlight">@color/blue</item>
    </style>

    <style name="hint_text_input_layout">
        <item name="android:textColor">@color/blue</item>
        <item name="android:textSize">@dimen/text_14sp</item>
        <item name="fontFamily">@font/muli</item>
    </style>

    <style name="error_text_input_layout">
        <item name="android:textColor">@color/red</item>
        <item name="android:textSize">@dimen/text_6sp</item>
        <item name="fontFamily">@font/muli</item>
    </style>