html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}

body {
  background-color: rgb(255, 255, 255);
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
}

.calculating-area {
  background-color: rgb(20, 20, 20);
  padding: 20px;
  border-radius: 20px;
  box-shadow: 0 4px 15px rgba(255, 255, 255, 0.1);
  text-align: center;
}

.result {
  font-family: Arial, sans-serif;
  font-size: 30px;
  min-height: 2rem;
  display: block;
  text-align: right;
  padding: 10px;
  margin-bottom: 15px;
  background-color: #5e5e5e;
  border-radius: 8px;
}

button {
  color: white;
  border: none;
  border-radius: 50px;
  padding: 10px;
  font-size: 20px;
  width: 50px;
  height: 50px;
  margin-right: 3px;
  align-items: center;
  justify-content: center;
}

button:hover {
  background-color: white;
  color: black;
}

.button1 {
  background-color: rgb(58, 58, 58);
}

.button2 {
  background-color: orange;
}

.button3 {
  background-color: rgb(255, 0, 0);
  font-size: 12px;
}

.button3 i {
  font-size: 16px;
}

.button3:hover {
  background-color: white;
  color: red;
  border: 1px solid red;
}