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I would like to leave the buttons centered, but I’m not getting, could someone give me a light? Thank you already! I would like to leave the forgot password button further to the right.
@charset "utf-8";
/* Documento CSS - CSS Document */
body,html{
  height: 100%; 
  overflow: hidden;
  background-image: url(https://i.imgur.com/X8ApJ7k.jpg);
  background-size: cover;
}
h1{
    text-align: center;
    background-color: #8AC32B;
    color: white;
    font-family: "Open Sans Condesed", sans-serif;
}
/* L-form design da aba de login.. */
.l-form{
  background-color:rgba(39, 41, 45, 0.5);
  border-radius:10px;
  padding: 12px;
}
.i-form{
  border-radius:12px;
  padding: 12px;
}
.relative {
  position: relative;
  width: 50%;
  bottom: 5px;
  border: 3px solid #8AC007;
} 
.myButton {
    box-shadow:inset 0px 1px 3px 0px #8AC32B;
    background:linear-gradient(to bottom, #8AC32B 5%, #8AC32B 100%);
    background-color:#768d87;
    border-radius:10px;
    border:1px solid #566963;
    display:inline-block;
    cursor:pointer;
    color:#ffffff;
    font-family:Arial;
    font-size:15px;
    font-weight:bold;
    padding:8px 25px;
    text-decoration:none;
    text-shadow:0px -1px 0px #8AC32B;
}
.myButton:hover {
    background:linear-gradient(to bottom, #6c7c7c 5%, #8AC32B 100%);
    background-color:#8AC32B;
}
.myButton:active {
    position:relative;
    top:1px;
}
.myButton2 {
    box-shadow:inset 0px 1px 3px 0px #8AC32B;
    background:linear-gradient(to bottom, #8AC32B 5%, #8AC32B 100%);
    background-color:#768d87;
    border-radius:10px;
    border:1px solid #566963;
    display:inline-block;
    cursor:pointer;
    color:#ffffff;
    font-family:Arial;
    font-size:15px;
    font-weight:bold;
    padding:8px 25px;
    text-decoration:none;
    text-shadow:0px -1px 0px #8AC32B;
}
.myButton:hover {
    background:linear-gradient(to bottom, #6c7c7c 5%, #8AC32B 100%);
    background-color:#8AC32B;
}
.myButton:active {
    position:relative;
    top:1px;
}
        
 
<!doctype html>
<html>
<head>
<link rel="stylesheet" type="text/css" href="./CSS-do-site.css">
<meta charset="utf-8">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css">
<title>Site</title>
</head>
<body>
    <div class="row align-items-center h-100 ">
    <div class="col-8 col-md-3 col-xs-8 mx-auto l-form offset-xl-5">
        <form class="form" method="post" id="login-form">
            <img src="https://i.imgur.com/1hdLnj7.png" width="351" height="150" class="row mx-auto rounded-circle"> 
            <div class="form-group ">
                <input type="text" placeholder="E-mail" class="form-control i-form">
            </div>
            <div class="form-group">
                <input type="password" placeholder="Senha" class="form-control i-form">
            </div>
            <div class="form-group">
                <button type="submit" onclick="userLogin()" class="btn btn-dark btn-md btn-block">Entrar</button>
            </div>
            <a href="#" class="myButton ">Cadastro</a>
            <a href="#" class="myButton2 ">Esqueci minha senha</a>
        </form>
    </div>
        
</div>
<h1 class="text-center"></h1> <!-- Título se for necessário-->
<div class="row align-items-center h-100 ">
<div class="col-8 col-md-3 col-xs-8 mx-auto l-form offset-xl-5">
    <form class="form" method="post">
          <img src="https://i.imgur.com/1hdLnj7.png" width="351" height="150" class="row mx-auto rounded-circle">
          <div class="form-group ">
            <input type="text" placeholder="E-mail" class="form-control i-form">
          </div>
          <div class="form-group">
            <input type="password" placeholder="Senha" class="form-control i-form">
          </div>
          <div class="form-group">
            <button type="submit" class="btn btn-dark btn-md btn-block">Entrar</button>
          </div>
        </form>
</div>
</div>
</body>
</html>


Hello @Edulink, welcome to stackoverflow. To help your question is better to put code focused on it. See that its function
userLoginhas nothing to do with the position of the buttons. A question more enchuta makes it much easier who wants to help you.– Guto
Very grateful friend, strong hug!
– Edulink