body {
  background-color: green;
  text-align: center;
}
main {
  display: flex;
  justify-content: space-around;
  flex-direction: column;
}

main .output {
  text-align: center;
  padding: 10px;
  min-width: 100px;
  font-size: 1.5em;
  background-color: rgb(70, 70, 70);
  color: orange;
}

main .input-area {
  text-align: center;
  font-size: 1.5em;
}

main .score {
  text-align: center;
  font-size: 2.5em;
  margin-top: 10px;
  padding: 10px;
  color: purple;
}
.input-area .button {
  color: orange;
  background-color: rgb(70, 70, 70);
  border: none;
  padding: 10px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 4px 2px;
  border-radius: 8px;
  min-width: 100px;
}

.input-area .button:hover {
  background-color: rgb(180, 180, 180);
  color: black;
}

input {
  color: darkcyan;
}
input:hover {
  background-color: yellow;
}