body {
  font-family: Arial, sans-serif;
  margin: 20px;
  padding: 0;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: #f4f4f9;
}
.container {
  width: 100%;
  max-width: 400px;
  background: #fff;
  padding: 20px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  border-radius: 8px;
  margin-top: 100px;
  margin-bottom: 20px;
}
h1 {
  text-align: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}
.form-group {
  margin-bottom: 15px;
}
label {
  display: block;
  margin-bottom: 5px;
  font-weight: bold;
}
input {
  width: 96%;
  padding: 8px;
  font-size: 1rem;
  border: 1px solid #ccc;
  border-radius: 4px;
}
button {
  width: 100%;
  padding: 10px;
  background-color: #007bff;
  color: white;
  border: none;
  border-radius: 4px;
  font-size: 1rem;
  cursor: pointer;
}
button:hover {
  background-color: #0056b3;
}
#result {
  margin-top: 15px;
  padding-top: 15px;
  text-align: center;
  font-size: 1.25rem;
  font-weight: bold;
}
.positive {
  color: green;
}
.negative {
  color: red;
}
.info-section {
  width: 100%;
  max-width: 600px;
  background: #f4f4f9;
  padding: 20px;
}
.info-section h2 {
  font-size: 1.5rem;
  margin-bottom: 10px;
}
.info-section p {
  font-size: 1rem;
  line-height: 1.6;
  text-align: left;
}