body {
  margin: 0;
  font-family: Arial, sans-serif;
  background-color: #ffeefc;
}


#allcontent {
  max-width: 960px;
  margin: 0 auto;
  background-color: #ffffff;
  border: 4px solid #ffb6c1;
  border-radius: 10px;
}

/* layout */
header {
  background-color: #ffcc33;   
  color: #333333;
  text-align: center;
  padding: 10px;
}

header img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto 10px;
}

nav {
  background-color: #66ccff;
}

nav ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}

nav li {
  margin: 0;
}

nav a {
  display: block;
  padding: 10px 15px;
  text-decoration: none;
  color: #000000;
  font-weight: bold;
}

nav a:hover {
  background-color: #ff99cc;
}

.layout {
  display: flex;
  flex-wrap: wrap;
  padding: 10px;
}

main {
  flex: 2 1 260px;
  padding: 10px;
}

aside {
  flex: 1 1 200px;
  padding: 10px;
  background-color: #e6ffcc;
}

footer {
  background-color: #ccccff;
  text-align: center;
  padding: 10px;
  margin-top: 10px;
}

@media (max-width: 700px) {
  .layout {
    flex-direction: column;
  }

  nav ul {
    flex-direction: column;
  }
}