:root {
  --color-active: #0080ff;
  --color-down: #000000;
  --color-mid: #808080;
  --color-up: #ffffff;
}
* {
  box-sizing: border-box;
  color: var(--color-up);
  font-size: 100%;
  font-weight: normal;
  margin: 0;
  outline: none;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
}
:not(input) {
  user-select: none;
  -webkit-user-select: none;
}
html, body {
  background: var(--color-down);
  height: 100%;
  overflow: hidden;
  overscroll-behavior-y: none;
  position: fixed;
  -webkit-text-size-adjust: none;
  touch-action: pan-y;
  width: 100%;
}
button {
  background: none;
  border: none;
  font-weight: bold;
  margin: 0.75em auto;
  padding: 0.75em 0.875em;
}
div {
  display: flex;
  flex-direction: column;
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 1.25em;
  height: 100%;
  overflow: hidden;
  justify-content: center;
}
form {
  margin: auto;
  max-width: 90vw;
  width: 20em;
}
h1 {
  padding: 1.25em;
  text-align: center;
}
iframe {
  border: none;
  height: 100%;
  position: fixed;
  top: 0;
  width: 100%;
}
input {
  background: none;
  border: none;
  border-bottom: 1px solid var(--color-mid);
  border-radius: 0;
  color: var(--color-up);
  padding: 0.75em;
  text-align: center;
  width: 100%;
}
input:focus {
  background: var(--color-up);
  color: var(--color-down);
}
li:last-child input {
  border-bottom: none;
}
p {
  text-align: center;
}
ul {
  border: 0.125em solid var(--color-up);
  border-radius: 0.5em;
  list-style: none;
  overflow: hidden;
}