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<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<link rel="stylesheet" href="css/bootstrap.css">
<link rel="stylesheet" type="text/css" href="estilo.css">
<title> Cadastro Cliente </title>
</head>
<body>
<div class="form-group">
<img src="Iuri.png" width="500px" alt="Fuzzy Cardigan"
class="img-thumbnail img-responsive" >
</div>
<div class="container">
<form action="" method="POST" name="formulario" >
<div class="form-group">
<div class=" col-md-5">
<label > Usuário ou E-MAIL</label>
<input type="text" name="login" class="form-control " placeholder=" Usuário ou E-MAIL" required="" >
</div>
</div>
<div class="form-group">
<div class="col-md-5">
<label> SENHA </label>
<input type="password" name="rg" class="form-control" placeholder="SENHA" required="" >
</div>
</div>
<input type="submit" value="Login" class="btn btn-primary" name="">
<div class="form-check">
<label > <input class="form-check-input" type="checkbox" value="" > Lembre-me </label>
</div>
</form>
</div>
</body>
</html>
I could not understand your doubt, the form is centered and responsive in mine. With print’s would be better to understand what I would like to accomplish.
– Matheus Martins
after here on my screen, it’s in the left corner, when I center it with margin-left it doesn’t get responsive;
– Iramar Oliveira
If possible, place images to illustrate your question, please.
– Matheus Martins
Okay, I put the image.
– Iramar Oliveira
place the image form inside the div container
– HudsonPH
Iramar if my answer helped you in any way consider marking it as accepted in this one on the left side near the little arrows. Just click on it, so Stackoverflow works better
– hugocsl