.CA {
  text-align: center;
  font-size: 20px;
  padding: 18px;
  width: 92%;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  color: rgba(230, 230, 230, 0.862);
  margin-left: 3px;
  height: 16px;
}

body {
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: hsl(0, 0%, 89%);
  background-image: url("Ba.jpg");

}

#calculator {

  font-family: Arial, sans-serif;
  background-color: hsl(0, 0%, 15%);
  border-radius: 20px;
  max-width: 520px;
  overflow: hidden;
}

#display {
  width: 460px;
  margin: 8px;
  height: 120px;
  font-size: 5rem;
  text-align: left;
  color: #f4f4f4;
  border: 10px;
  letter-spacing: 3px;
  background-color: hsla(0, 0%, 26%, 0.939);
}

#keys {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  padding: 25px;
}

button {
  width: 100px;
  height: 100px;
  border-radius: 50px;
  border: none;
  background-color: hsl(0, 0%, 30%);
  color: #fff;
  padding: 25px;
  font-size: 2.6rem;

  cursor: pointer;

}

button:hover {
  background-color: hsl(0, 0%, 40%);
}

button:active {
  background-color: hsl(0, 0%, 55%);
}

.operator-btn {
  background-color: hsl(36, 90%, 50%);
}

.operator-btn:hover {
  background-color: hsl(36, 90%, 65%);
}

.operator-btn:active {
  background-color: hsl(36, 90%, 75%);
}

.operator-btn2 {
  background-color: hsl(25, 90%, 50%);
}

.operator-btn2:hover {
  background-color: hsl(25, 90%, 65%);
}

.operator-btn2:active {
  background-color: hsl(25, 90%, 75%);
}

@media only screen and (max-width: 500px) {

  .CA {
    font-size: 15px;
    padding: 10px;
    width: 92%;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin-left: 2px;
    height: 12px;
  }

  #calculator {
    width: 316px;
    border-radius: 15px;
  }

  #display {
    width: 300px;
    margin-left: 6px;
    height: 90px;
    font-size: 3rem;
    text-align: left;
    color: #f4f4f4f4;
    border: 10px;
    letter-spacing: 1px;
  }

  #keys {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
    padding: 8px;
  }

  button {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    padding: 15px;
    font-size: 2rem;
  }
}