popup.css

body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 10px;
  width: 250px;
  position: relative;
}

.close-button {
  position: absolute;
  top: 10px;
  right: 10px;
  background-color: transparent;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: black;
}

.close-button:hover,
.close-button:focus {
  color: #45a049;
}

h1 {
  font-size: 18px;
  margin-bottom: 10px;
}

#calculateButton {
  background-color: #4CAF50;
  color: white;
  border: none;
  padding: 10px 20px;
  font-size: 16px;
  margin: 5px 0;
  cursor: pointer;
  border-radius: 4px;
}

#calculateButton:hover,
#calculateButton:focus {
  background-color: #45a049;
}

#durationOutput {
  margin-top: 10px;
  font-size: 16px;
  color: #333;
}