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

/* Body and header */
body {
  font-family: Arial, sans-serif;
  background-color: #f4f4f4;
  color: #333;
  padding-top: 50px;
}

header {
  position: fixed;
  top: 0;
  width: 100%;
  background-color: #333;
  color: white;
  padding: 15px 0;
}

.navbar h1 {
  margin-left: 20px;
  font-size: 2em;
}

.navbar nav ul {
  list-style-type: none;
  float: right;
  margin-right: 20px;
}

.navbar nav ul li {
  display: inline;
  margin-left: 15px;
}

.navbar nav ul li a {
  color: white;
  text-decoration: none;
}

h2 {
  font-size: 2.5em;
  text-align: center;
  margin: 40px 0;
}

section {
  padding: 60px 20px;
}

/* Styling for the calculator */
.calculatorSection {
  display: none;
  text-align: center;
}

.calculator {
  width: 260px;
  margin: 0 auto;
  background-color: #fff;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.1);
}

#display {
  width: 100%;
  height: 40px;
  font-size: 1.5em;
  text-align: right;
  padding: 10px;
  border: 1px solid #ccc;
  margin-bottom: 20px;
  background-color: #f9f9f9;
}

.buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.button {
  font-size: 1.2em;
  padding: 15px;
  border: none;
  border-radius: 5px;
  background-color: #f0f0f0;
  cursor: pointer;
}

.button:hover {
  background-color: #ddd;
}

.operator {
  background-color: #ff9f00;
  color: white;
}

.operator:hover {
  background-color: #ff7f00;
}

.extra-buttons {
  margin-top: 20px;
  display: flex;
  justify-content: space-between;
}

.extra-buttons .button {
  width: 48%;
}

footer {
  background-color: #333;
  color: white;
  text-align: center;
  padding: 10px 0;
  margin-top: 40px;
}