* {
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  background-color: #f7f9fc;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

.container {
  background-color: white;
  padding: 30px 40px;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  text-align: center;
  width: 100%;
  max-width: 400px;
}

h1 {
  font-size: 1.5rem;
  margin-bottom: 20px;
  color: #333;
}

input {
  width: 100%;
  padding: 10px;
  font-size: 1rem;
  border: 1px solid #ccc;
  border-radius: 8px;
  margin-bottom: 15px;
}

button {
  padding: 10px 20px;
  margin: 5px;
  border: none;
  font-size: 1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

#check-btn {
  background-color: #4CAF50;
  color: white;
}

#check-btn:hover {
  background-color: #45a049;
}

#clear-btn {
  background-color: #f44336;
  color: white;
}

#clear-btn:hover {
  background-color: #d73833;
}

#results-div {
  margin-top: 20px;
  font-weight: bold;
  font-size: 1.1rem;
}