body {
  font-family: Arial, sans-serif;
  background: #f9f9f9;
  margin: 0;
  padding: 0;
}
.container {
  max-width: 600px;
  margin: 40px auto;
  background: #fff;
  padding: 20px 30px;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
.valid-box {
  background-color: #e2f8e6;
  color: #0a8a26;
  padding: 15px;
  text-align: center;
  font-weight: bold;
  border-radius: 5px;
  margin-bottom: 25px;
}
.field {
  margin-bottom: 15px;
}
.field label {
  display: block;
  font-weight: bold;
  color: #333;
  margin-bottom: 4px;
}
.field input {
  width: 100%;
  padding: 10px;
  border: 1px solid #ccc;
  background: #f4f4f4;
  border-radius: 5px;
  font-size: 15px;
}