html, body {
  height: 100%;
  margin: 0;
  font-family: 'Noto Sans JP', sans-serif;
  background: linear-gradient(135deg, #f8fbff, #fff8fb);
  padding: 1rem;
  box-sizing: border-box;
}

#menu ul {
  list-style: none;
  padding: 0;
  margin: 10px 0;
  display: flex;
  gap: 20px;
  font-weight: 600;
  font-family: 'Noto Sans JP', sans-serif;
}

#menu li {
  
}

#menu a {
  text-decoration: none;
  color: #333;
  padding: 6px 10px;
  border-radius: 4px;
  transition: background-color 0.3s ease, color 0.3s ease;
  display: inline-block;
}

#menu a:hover,
#menu a:focus {
  background-color: pink;
  color: #fff;
  outline: none;
}


main {
  background: rgba(255, 255, 255, 0.8);
  padding: 2rem;
  border-radius: 1rem;
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
  box-sizing: border-box;
}

h1 {
  text-align: right;
  font-weight: 600;
  margin-bottom: 2rem;
  font-size: 2rem;
}

h3 {
  margin-top: 2rem;
  text-align: left;
  color: #4b5563;
  font-size: 1.25rem;
}

p {
  margin: 0.5rem 0;
  font-size: 1rem;
  text-align: left;
}

header {
  border-bottom: 3px solid pink;
  padding-bottom: 0.5rem;
}

header p {
  
display:block;
}

header img {
  background: pink;
  border-radius: 1rem;
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}

#content {
  border-bottom: 3px solid pink;
  margin-bottom: 3rem;
}

@media (max-width: 700px) {
  html, body {
  padding: .5rem;
  background:rgba(255, 255, 255, 0.8);
}

  main {
    padding: 0rem;
    width: 100%;
    max-width:100%;
  }

  h1 {
    font-size: 1.5rem;
    text-align: center;
    margin-bottom: 1.5rem;
  }

  h3 {
    font-size: 1.1rem;
  }

  p {
    font-size: 0.9rem;
  }

  #content {
    margin-bottom: 1.5rem;
  }
}