* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', sans-serif;
  background-color: #f8f8f8;
  color: #333;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.box {
  background-color: white;
  padding: 20px;
  border-radius: 5px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  text-align: center;
  max-width: 400px;
  width: 100%;
}

h1 {
  font-size: 28px;
  margin-bottom: 20px;
}

label {
  display: block;
  font-size: 16px;
  margin-bottom: 10px;
  color: #333;
}

input {
  padding: 8px 10px;
  font-size: 16px;
  margin-bottom: 20px;
  border: 1px solid #ddd;
  border-radius: 4px;
  color: #333;
  width: 100%;
}

input:focus {
  outline: 2px solid #218838;
}

button {
  padding: 10px;
  background-color: #28a745;
  color: white;
  border: none;
  border-radius: 4px;
  font-size: 16px;
  cursor: pointer;
  width: 100%;
}

button:hover,
button:active {
  background-color: #218838;
}


#result {
  margin-top: 20px;
  font-size: 18px;
  font-weight: bold;
}

#validation {
  color: #dc3545;
  margin-top: 20px;
  margin-bottom: 20px;
  font-size: 16px;
}