Как сделать такой input?

<form style = 'position: relative; display: flex; justify-content: space-between; border-bottom: 1px solid black;'>
    <input style = 'position: relative; margin: 10px; border: 0;' id = 'email' type = 'email' placeholder = 'email'/>
    <input style = 'position: relative; background: transparent; border: 0;' id = 'button' type = 'button' value = 'subscribe'/>
</form>