body {
  background-color: #000;
  color: #eee;
  font-family: monospace;
  text-align: center;
  padding: 2em;
}
h1 {
  color: crimson;
  font-size: 2.8em;
}
input, button {
  padding: 0.6em;
  margin: 0.3em;
  font-size: 1em;
  background: #111;
  color: crimson;
  border: 1px solid crimson;
}
button:hover {
  background: crimson;
  color: black;
}
.result {
  margin-top: 1em;
  font-size: 1.4em;
  color: gold;
}
.confirm {
  margin-top: 0.5em;
  color: #0f0;
  font-weight: bold;
}
table {
  margin: 2em auto;
  width: 85%;
  border-collapse: collapse;
}
th, td {
  border: 1px solid crimson;
  padding: 0.5em;
}