form {
  max-width: 400px;
  margin: 1rem auto;
  padding: 1rem;
  background: #f5f7fa;
  border-radius: 6px;
  box-shadow: 0 2px 6px rgba(44, 62, 80, 0.15);
  font-family: Arial, sans-serif;
}

label {
  display: block;
  margin-bottom: 0.25rem;
  font-weight: 600;
  color: #2c3e50;
}

input[type="email"] {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1.5px solid #ccc;
  border-radius: 4px;
  font-size: 1rem;
  transition: border-color 0.3s ease;
}
label.required::after {
  content: " *";
  color: #d33;
  font-weight: normal;
  margin-left: 0.2em;
  font-size: 1.1em;
  vertical-align: super;
  font-family: sans-serif;
}  
.required-note {
  color: #d33;
  font-size: 0.9rem;
  margin-top: 0.5rem;
  font-family: sans-serif;
}

input[type="email"]:focus {
  border-color: #2980b9;
  outline: none;
}

button[type="submit"] {
  margin-top: 1rem;
  padding: 0.6rem 1.2rem;
  background-color: #2980b9;
  color: #ecf0f1;
  border: none;
  border-radius: 4px;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 0.25s ease;
}

button[type="submit"]:hover {
  background-color: #1f598a;
}