style.css

@font-face {
  font-family: "JFドットAyu明朝18";
  src: url("JF-Dot-AyuMin18.ttf");
}

html, body {
  width: 100%;
  color: #fff;
  line-height: 1;
  font-family: "ＭＳ Ｐゴシック", "Osaka", sans-serif;
  margin: 0;
  background: url("img/haikei.gif");
  background-size: 40px;
  display: flex;
  background: #000;
}

a {
  cursor: pointer;
}

h1 {
  margin: 0;
}

h1 a {
  color: inherit;
  text-decoration: none;
}

h1 a:hover {
  text-decoration: underline;
}

p {
  margin: 4px;
}

#wrapper {
  width: 700px;
  margin: auto;
  padding: 24px 0;
  overflow: hidden;
}

#header {
  display: flex;
  gap: 8px;
  align-items: center;
}

#plane {
  color: blue;
}

#access-counter {
  display: flex;
  align-items: center;
  justify-content: center;
}

#access-counter-no {
  margin: 0 4px;
}

@media screen and (max-width: 900px) {
  #nav {
    display: none;
  }

  main {
    margin-left: 0;
  }
}

#footer {
  color: yellow;
  text-align: left;
  margin-top: 16px;
  animation: footer-marquee 5s linear infinite;
}

@keyframes footer-marquee {
  0% {
    transform: translateX(0%);
  }
  50% {
    transform: translateX(calc(100% - 210px));
  }
}