.equation {
  display:flex;
  justify-content:center;
  align-items:center;
  gap:.75rem;
  font-size:2rem;
  margin:2rem 0;
  flex-wrap: wrap;
}
.equation input{
  width:5ch;
  text-align:center;
  font-size:2rem;
  padding:.3rem;
  border:2px solid #bbb;
  border-radius:8px;
}