I’m unable to change the size and color of the input button type Submit:

Question

   input [type=submit] { //esse comando não ta funconando 
	background-color: #111f66; 
	border: none;

 <form method="POST" action="processa.php"  >
		<input type="email" name="" placeholder="Usuário" >
		<input type="password" name="" placeholder="Senha" >
		<input type="submit" value="ACESSAR"/>   //esse botão
 

Answer 1

Your mistake is that you left a space when you declared the property, between the word input and the keys [] should not have room

This way you wrote the comment in CSS with double bar // tb is not advisable, in CSS to write comments use /* seu comentário aqui */

input[type=submit] {
  background-color: #111f66;
  border: none;
}

<form method="POST" action="processa.php">
  <input type="email" name="" placeholder="Usuário">
  <input type="password" name="" placeholder="Senha">
  <input type="submit" value="ACESSAR" />
</form>