@charset "UTF-8";

body {
  margin: 0;
  font-family: "Noto Sans JP", serif;
}
body > h1 {
  margin: 1em;
}
body > p {
  margin: 1em;
}
body > form {
  margin: 1em;
}
body > ul {
  margin: 1em;
}
body > div {
  margin: 1em;
}
body > #header {
  position: sticky;
  top: 0;
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
  background-color: rgb(255,255,255);
  padding: 1em;
}