html {
  width: 100vw;

}

body {
  min-height: 100vh;
  max-width: 800px;
  margin: auto;
  padding: 5px 5px;
  background-color: #f9f9f9;
  color: 111;
}

ol {
  padding-left: 1.5em;
}

ol ol {
  list-style-type: decimal;
}

ol ol {
  list-style-type: lower-latin;
}

ol ol ol {
  list-style-type: lower-roman;
}

p, li {
  padding-top: 0.2em;
  text-align: justify;
}

img {
  display: block;
  max-width: 700px;
  width: 100%;
  margin: auto;
}

.menu {
  color: #f9f9f9;
  background: #111;
  text-align: center;
}

.menu p {
  margin: 1em auto;
  border: #f9f9f9 solid 3px;
  border-radius: 10px;
  padding: 1em;
  text-align: center;
  max-width: 400px;
}

.menu a {
  text-decoration: none;
  color: #f9f9f9;
}

table {
  margin: auto;
  border-spacing: 0;
}

th,td {
  border: 1px solid #111;
  padding: 0 1em;
}

iframe {
  max-height: 600px;
  max-width: 790px;
  width: 100%;
  aspect-ratio: 4/3;
}

@media screen and (max-height:600px) and (orientation:landscape) {
  iframe {
    aspect-ratio:19.5/8;
  }
}