body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
               Roboto, Helvetica, Arial, sans-serif;
  background: #f7f8fc;
  color: #222;
}

nav {
  text-align: right;
  padding: 18px 28px;
  background: #fff;
}

nav a {
  margin-left: 18px;
  text-decoration: none;
  color: #333;
  font-weight: 500;
}

header img {
  width: 100%;
  display: block;
}

.profile {
  text-align: center;
  padding: 60px 24px;
}

.profile img {
  width: 140px;
  border-radius: 50%;
}

.profile h1 {
  margin-top: 20px;
  color: #6A4DFF;
}

.app {
  max-width: 900px;
  margin: auto;
  padding: 40px 24px;
  text-align: center;
}

.btn {
  display: inline-block;
  margin-top: 24px;
  padding: 14px 32px;
  background: #6A4DFF;
  color: #fff;
  text-decoration: none;
  border-radius: 10px;
  font-weight: 600;
}

footer {
  text-align: center;
  padding: 40px;
  background: #111;
  color: #aaa;
}