html,
body {
  height: 100%;
}

body {
  display: flex;
  align-items: center;
  padding-top: 40px;
  padding-bottom: 40px;
  background-color: #000;
}

.form-signin {
  width: 100%;
  max-width: 330px;
  padding: 15px;
  margin: auto;
}

.form-signin .checkbox {
  font-weight: 400;
}

.form-signin .form-floating:focus-within {
  z-index: 2;
}

.form-signin input[name="nombre"] {
  margin-bottom: -1px;
  
    border-right: 2px solid #319a3f;
     border-left: 2px solid #319a3f;
      border-top: 2px solid #319a3f;
      
  border-bottom-right-radius: 0;
  border-bottom-left-radius: 0;
}

.form-signin input[name="apellidos"] {
  margin-bottom: 10px;
   border-bottom: 2px solid #319a3f;
    border-right: 2px solid #319a3f;
     border-left: 2px solid #319a3f;
       border-top-left-radius: 0;
  border-top-right-radius: 0;
}

.form-signin input[name="mail"] {
  margin-bottom: -1px;
  
    border-right: 2px solid #319a3f;
     border-left: 2px solid #319a3f;
      border-top: 2px solid #319a3f;
      
  border-bottom-right-radius: 0;
  border-bottom-left-radius: 0;
}

.form-signin input[name="mail2"] {
  margin-bottom: 10px;
   border-bottom: 2px solid #319a3f;
    border-right: 2px solid #319a3f;
     border-left: 2px solid #319a3f;
       border-top-left-radius: 0;
  border-top-right-radius: 0;
}

.form-signin input[name="password"] {
  margin-bottom: -1px;
  
    border-right: 2px solid #319a3f;
     border-left: 2px solid #319a3f;
      border-top: 2px solid #319a3f;
      
  border-bottom-right-radius: 0;
  border-bottom-left-radius: 0;
}

.form-signin input[name="password2"] {
  margin-bottom: 10px;
   border-bottom: 2px solid #319a3f;
    border-right: 2px solid #319a3f;
     border-left: 2px solid #319a3f;
       border-top-left-radius: 0;
  border-top-right-radius: 0;
}

.form-signin input[name="mail_send"] {
  margin-bottom: 10px;
  
    border-right: 2px solid #319a3f;
     border-left: 2px solid #319a3f;
      border-top: 2px solid #319a3f;
      border-bottom: 2px solid #319a3f;
      

}
/*

  border-top-left-radius: 0;
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
  border-bottom-left-radius: 0;
*/