html,
body {
  margin: 0 auto;
  font-family: Arial;
  background-color: rgb(125, 125, 125);
  color: white;
  padding: 0;
}

main {
  position: relative;
  margin: 0 auto;
  padding: 0;
}

header,
main>nav,
main>div,
main>article {
  width: 100%;
  position: relative;
  display: block;
  margin: 0 auto;
  padding: 0 auto;
}

header,
main>nav,
main>article {
  z-index: 1;
}

main>header>*,
main>nav>*,
main>article>* {
  z-index: 1;
}

header {
  margin: 0;
  padding: 0;
  text-align: center;
  font-size: 1em;
  background: rgba(255, 255, 255, 1);
}

header h1 {
  color: black;
}

h1 {
  margin: 0;
  padding: 1em;
}

h2 {
  text-align: center;
}

a {
  text-decoration: none;
  color: white;
}

a:hover {
  text-decoration: underline;
}

nav {
  width: 100%;
  background: rgba(255, 255, 255, 0.25);
  margin: 0;
  padding: 0;
  display: flex;
}

nav button.mode {
  margin: 0;
  padding: 1em 2em;
  border: none;
  color: white;
  display: inline-block;
  position: relative;
  width: calc(100%);
  background: none;
  flex-basis: 100%;
}

#sensitiveButton {
  background-color: rgba(255, 255, 255, 1);
  color: rgba(0, 0, 0, 1);
}

#dualButton {
  display: none;
}

article.piece {
  padding: 0;
  overflow: hidden;
  margin: 4px 0;
  width: calc(100%);
}

article.piece.regular {
  display: none;
}

button.pieceButton {
  margin: 0 auto;
  padding: auto;
  background: none;
  width: 100%;
  border: none;
  color: white;
  background: rgba(255, 255, 255, 0.25);
  border-radius: 2em;
}

button:hover {
  cursor: pointer;
  background: rgba(255, 255, 0, 1);
  color: black;
}

iframe.pieceFrame {
  width: calc(100% - 0.5px);
  height: calc(100vh - 18em);
  border: none;
  display: none;
  border-radius: 2em;
}

article.piece p {
  text-align: center;
}

article#information {
  padding: 1em;
  width: calc(100% - 2em);
  background-color: rgba(255, 255, 255, 0.25);
}

#disclaimer {
  display: none;
}

article p {
  padding: 0.5em 3em;
}

article p#iphone {
  display: none;
}

#articleButton {
  width: 100%;
  border: none;
  background-color: rgba(0, 0, 0, 0.25);
  color: white;
}

#articleButton:hover {
  text-decoration: underline;
  color: rgba(0, 0, 0, 1);
  background: rgba(255, 255, 0, 1);
  cursor: pointer;
}

@supports (-webkit-touch-callout: none) {
  article p#iphone {
    display: block;
  }
}

footer {
  width: 100%;
  text-align: center;
  background: rgba(255, 255, 255, 1);
  padding-top: 0.25em;
  padding-bottom: 0.25em;
  margin: 0 auto;
  color: black;
}

footer a {
  text-decoration: none;
  color: black;
}

footer a:hover {
  text-decoration: underline;
}

@media (min-width: 1024px) {
  main {
    display: block;
    width: 100%;
  }

  article.piece {
    width: calc(100vw/2 - 2.5em);
    display: inline-block;
    margin-left: auto;
    margin-right: auto;
    padding: 1em;
  }

  nav button.mode {
    width: auto;
    margin: 0 auto;
  }

  #dualButton {
    display: inline-block;
    margin-left: auto;
  }
}