body {
  font-family: monospace;
  background: #101317;
  text-align: center;
  padding-top: 100px;
  color: #ffffff;
  text-shadow: 1px 1px 5px lightskyblue;
}

.container {
  background: #1a1d22;
  padding: 30px;
  border-radius: 15px;
  width: 300px;
  margin: auto;
  box-shadow: 0 0 15px rgba(0, 0, 0, 0.6);
}

#output {
  font-size: 20px;
  margin-top: 20px;
  text-shadow: 1px 1px 3px #000;
}

#tips {
  font-style: italic;
  color: #bbbbbb;
  margin-top: 10px;
  text-shadow: 1px 1px 2px #000;
}

input[type="number"] {
  padding: 10px;
  font-size: 16px;
  width: 100%;
  margin-bottom: 10px;
  box-sizing: border-box;
  border: none;
  border-radius: 5px;
  background: #2c2f36;
  color: #ffffff;
  text-shadow: 1px 1px 1px #000;
  font-family: monospace;
}

button {
  padding: 10px 20px;
  font-size: 16px;
  cursor: pointer;
  background: #4287f5;
  color: white;
  border: none;
  border-radius: 5px;
  box-shadow: 1px 1px 3px #000;
  transition: background 0.3s ease;
  font-family: monospace;
}

button:hover {
  background: #45a049;
}

h2{
  font-size: 32px;
}

p{
  font-size: 20px;
}

#backButton {
  margin-top: 30px;
  background: #101317;
  color: #ffffff;
  padding: 12px;
  border-radius: 10px;
  cursor: pointer;
  ttext-shadow: 1px 1px 5px lightskyblue;
  transition: background 0.3s ease;
  font-family: monospace;
  box-shadow: inset 0 0 0 2px #2a2e34;
}

#backButton:hover {
  background: #0c0f12;
}