* {
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

body {
  margin: 0;
  height: 100vh;
  background: url("img1.jpg") center/cover no-repeat;
  display: flex;
  justify-content: center;
  align-items: center;
}

#app {
  background: rgba(0, 0, 0, 0.35);
  padding: 20px;
  border-radius: 15px;
}

#display {
  width: 100%;
  font-size: 30px;
  text-align: right;
  margin-bottom: 15px;
  padding: 10px;
  border: none;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.4);
  color: white;
}

.buttons {
  display: grid;
  grid-template-columns: repeat(4, 70px);
  gap: 10px;
}

button {
  font-size: 20px;
  padding: 15px;
  border: none;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.15);
  color: white;
  cursor: pointer;
}

button:hover {
  background: rgba(255, 255, 255, 0.3);
}

#equal {
  grid-column: span 4;
  background: rgba(0, 255, 150, 0.3);
}

#finalImage {
  display: none;
  position: fixed;
  max-width: 80%;
  max-height: 80%;
}