body {
  font-family: Arial;
  background: #f5f6f8;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  width: 320px;
  background: white;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  text-align: center;
}

input {
  width: 100%;
  padding: 10px;
  margin: 8px 0;
  box-sizing: border-box;
}

button {
  width: 100%;
  padding: 10px;
  background: black;
  color: white;
  border: none;
  cursor: pointer;
}

.result {
  margin-top: 15px;
  padding: 10px;
  background: #f1f1f1;
  border-radius: 8px;
}
.container {
  width: 320px;
  max-width: 90%;
  background: white;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  text-align: center;
}