body {
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100vh;
  justify-content: space-between;
  margin: 0;
}

#calculator {
  margin: 40px 0px 40px 0px;
  height: 600px;
  width: 400px;
  background-color: grey;
  border: solid black;
  border-radius: 25px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

#footer {
  padding: 20px 0px;
  background-color: grey;
  border: solid black;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 30px;
}

a {
  text-decoration: none;
  color: black;
}

.screen {
  background-color: white;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  height: 120px;
  margin: 10px;
  border-radius: 15px;
  border: solid black;
}

#input {
  margin-top: 0px;
  margin-left: 30px;
  font-size: 22px;
  height: 30px;
}

#result {
  align-self: flex-end;
  margin-right: 40px;
  font-size: 40px;
  margin-top: 20px;
}

.row {
  display: flex;
  justify-content: space-between;
  margin: 0px 10px;
}

.button {
  height: 80px;
  width: 80px;
  background-color: white;
  border-radius: 10px;
  border: solid black;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Times New Roman", Times, serif;
  font-size: 30px;
}

.button.zero {
  width: 180px;
}

.button:hover {
  background-color: #d3d3d3;
}