button {
  width: 100%;
  height: 100%;
  font-size: 20px;
}

button:hover {
  background: grey;
  cursor: pointer; 
}

.input {
  font-family: font-family: Impact, Haettenschweiler, "Franklin Gothic Bold", Charcoal, "Helvetica Inserat", "Bitstream Vera Sans Bold", "Arial Black", sans serif;
  font-weight: 900;
}

#screen {
  background: white;
  text-align: right;
  font-size: 25px;
  color: black;
  width: 100%;
}

table {
  border: .5px solid black;
  border-radius: 10px;
  margin: auto;
  margin-top: 4.5em;
  background: black;
  padding: 1em;
}

td {
  height: 5em;
  width: 5em;
  margin: .2em;
  border: 1px solid black;
  color: black;
}