:root {
  --red: #b80808;
  --green: #03940b;
  --transparent-white: rgba(255, 255, 255, 0.85);
}
body {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
}

#site-container {
  display: grid;
  grid-template-rows: 1fr auto 1fr;
  text-align: center;
  background-image: url(https://i.postimg.cc/vmqCHdV8/2mountain-1920x1200-minimal-half-moon-hd-4792.jpg);
  background-size: cover;
  min-height: 100vh;
}

#site-content {
  background-color: var(--transparent-white);
  padding: 50px;
  border-radius: 10px;
  width: 400px;
  margin: 0 auto;
}

#site-content h1 {
  text-transform: uppercase;
}
#number {
  border-radius: 10px;
  width: 100%;
  padding-top: 10px;
  padding-bottom: 10px;
  border: 1px solid #ccc;
  font-size: 1.5em;
  font-weight: 100;
  text-align: center;
}

#output {
  min-height: 200px;
  border: 1px solid #333;
  border-radius: 10px;
  padding: 50px;
  padding-top: 0px;
  background-color: white;
}

#output h1 {
  text-transform: uppercase;
  margin-top: 10px;
}

#output p {
  margin-top: 50px;
  font-size: 1.25em;
}
.button {
  padding: 15px 40px;
  margin: 30px 5px;
  border-radius: 5px;
  border: 3px solid #000;
  background: unset;
  cursor: unset;
  letter-spacing: 2px;
  text-transform: uppercase;
  font-weight: 900;
  transition: all 0.2s ease-in-out;
}

.green:hover {
  background-color: var(--green);
  color: white;
  border-color: var(--green);
}

.red:hover {
  background-color: var(--red);
  color: white;
  border-color: var(--red);
}

label[for='number'] {
  text-transform: uppercase;
  font-size: 1.25em;
  display: none;
}

.bold {
  font-weight: bold;
}

.js-output.error {
  color: red;
}

footer p {
  position: fixed;
  bottom: 0;
  margin: 0;
  font-size: 12px;
  text-align: center;
  display: block;
  background-color: #ccc;
  width: 100%;
  left: 0;
  font-weight: bold;
  padding: 3px;
}

footer p a {
  text-decoration: none;
}