html,
body {
  margin: 0;
  padding: 0;
}

* {
  box-sizing: border-box;
}

.content {
  width: 100%;
  max-width: 900px;
  margin: 50px auto;
  padding: 5px;
  box-shadow: 0 5px 35px rgba(0, 0, 0, .1);
}