html {
  box-sizing: border-box;
}

*,
*::before,
*::after {
  box-sizing: inherit;
}

td {
  width: 20px;
  background-color: grey;
  text-align: center;
}

table {
  padding: 10px;
  background-color: rgb(211, 208, 208);
}
input {
  margin-right: 10px;
}

.calc{
  display: flex;
  justify-content: center;
}

#result{
  text-align: center;
  color: aqua;
  font-size: 20px;
}