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

body {
  font-family: 'Times New Roman', Times, serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
  background-color: #f0f8ff;
}
h2{
  text-align: left;
}

.container {
  width: 85%;
  max-width: 850px;
  background-color: #ffffff;
  padding: 30px;
  border-radius: 10px;
  border: 2px solid #a3d8f4;
  box-shadow: 0 0 6px rgba(0, 0, 0, 0.1);
  text-align: center;
}

canvas {
  border: 1px solid #ccc;
  background-color: #ffffff;
  margin-bottom: 20px;
}

button {
  padding: 10px 20px;
  margin: 10px;
  border: none;
  border-radius: 6px;
  background-color: #4caf50;
  color: white;
  font-size: 16px;
  cursor: pointer;
}

button:hover {
  background-color: #388e3c;
}

.math-output {
  font-size: 20px;
  margin-top: 20px;
  background-color: #e7f7ff;
  padding: 15px;
  border-radius: 8px;
}

#input-btn {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 15px;
  margin-top: 15px;
}

input[type="text"] {
  padding: 8px;
  width: 100px;
  font-size: 16px;
  text-align: center;
  border: 1px solid #aaa;
  border-radius: 5px;
}

.response {
  margin-top: 15px;
  font-size: 18px;
}

#bottom-btn {
  margin-top: 20px;
}