body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}
nav {
  background-color: #333;
  overflow: hidden;
}

nav a {
  float: left;
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

nav a:hover {
  background-color: #ddd;
  color: black;
}

aside {
  background: #f4f4f4;
  padding: 10px;
  width: 25%;
  float: right;
}

main {
  margin: 20px;
}

footer {
  background-color: #333;
  color: white;
  text-align: center;
  padding: 10px;
  clear: both;
}

@media (max-width: 768px) {
  body {
    margin: 0;
    padding: 0;
  }

  header, nav, main, aside, footer {
    width: 100%;
    float: none;
    display: block;
  }

  nav a {
    display: block;
    width: 100%;
    text-align: center;
    padding: 12px;
    border-bottom: 1px solid #444;
  }

  img, video, audio, iframe {
    max-width: 100%;
    height: auto;
  }
}
.profile-aside {
  float: right;
  width: 250px;
  padding: 10px;
  background-color: #f9f9f9;
  text-align: center;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  margin: 20px;
}

.profile-pic {
  width: 75%;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 0 5px rgba(0,0,0,0.2);
}