* {
  margin: auto;
}
.calculator {
  text-align: center;
  width: 60%;
  height: 60%;
  border: 2px solid black;
  margin: auto;
  margin-top: 100px !important;
  padding: 10px;
  border-radius: 10px;
}
table {
  margin: auto;
  width: 100%;
}
input {
  width: 90%;
  margin-bottom: 60px;
  height: auto;
  padding: 10px;
  font-size: 50px;
  border-radius: 23px;
}
button {
  width: 90%;
  height: auto;
  font-size: 30px;
  margin: 6px;
  background-color: #f1f3f4;
  border-radius: 12px;
  border: none;
  transition: 0.3s linear;
  font-family: "Gill Sans", "Gill Sans MT", Calibri, "Trebuchet MS", sans-serif;
}
button:hover {
  background-color: black;
  color: white;
  border: none;
}
#equal-btn {
  background-color: #4285f4;
  color: white;
  font-weight: 900;
}
#equal-btn:hover {
  background-color: rgb(158, 128, 8);
  color: black;
  border: none;
}
#btn-gray {
  background-color: #dadce0;
}
#btn-gray:hover {
  background-color: gray;
  border: none;
}