header {
  width: 100%;
  background: #222222;
  padding: 12px;
}
nav {
  display: flex;
  gap: 25px;
}
nav a {
  position: relative;
  color: #ffffff;
  text-decoration: none;
  font-weight: bold;
  padding: 4px 0;
}
nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0%;
  height: 2px;
  background: #ffcc00;
  transition: 0.3s;
}
nav a:hover::after {
  width: 100%;
}
body{
  background-color: #F5F5DC;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 0;
  padding: 10px;
}
div{
  max-width: 1000px;
  width: 100%;
  box-sizing: border-box;
}
p{
  line-height: 1.6;
}
.library{
  display: flex;
  gap: 10px;
}
.komeiji{
  font-weight: bold;
}
.yakumo{
  color: #FF0000;
}
.scarlet{
  text-decoration: underline;
}
pre {
  background: #2d2d2d;
  color: #f8f8f2;
  padding: 12px;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 14px;
}
code {
  font-family: Consolas, "Courier New", monospace;
}