I'm learning CSS. How to style input and submit button with CSS?

I'm trying create something like this but I have no idea how to do

<form action="#" method="post">
    Name <input type="text" placeholder="First name"/>
    <input type="text" placeholder="Last name"/>
    Email <input type="text"/>
    Message <input type="textarea"/>
    <input type="submit" value="Send"/>
</form>

enter image description here

html css
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