flex-example.css

/* Layout */
.flex {
  display: flex;
}
.ex-layout,
.center {
  margin: 1rem auto;
  max-width: 480px;
  border: 4px solid rgba(0, 0, 0, 0.2);
  border-radius: 0.25rem;
}
.ex-header {
  background-color: rgba(250, 0, 0, 0.2);
}
.ex-nav {
  justify-content: space-between;
  align-items: center;
  background-color: rgba(250, 0, 0, 0.2);
  padding: 0.5rem;
}
.ex-link {
  margin-left: 0.5rem;
}
.ex-title {
  text-align: center;
  padding: 0.5rem;
}
.ex-aside {
  flex: 0 0 25%;
  padding: 0.5rem;
  background-color: rgba(0, 250, 0, 0.2);
}
.ex-section {
  flex: 1 1 auto;
  padding: 0.5rem;
  background-color: rgba(0, 0, 250, 0.2);
}
.ex-side {
  flex: 0 0 20%;
  padding: 0.25rem;
  background-color: rgba(0, 250, 250, 0.1);
}
.ex-item {
  padding: 0.25rem;
  margin-bottom: 0.25rem;
  background-color: rgba(0, 250, 200, 0.2);
}
.ex-footer {
  background-color: rgba(250, 100, 0, 0.2);
  text-align: center;
  padding: 0.5rem;
}
.center {
  justify-content: center;
  align-items: center;
  height: 8rem;
}
.centered {
  padding: 0.25rem 0.5rem;
  background-color: rgba(250, 0, 0, 0.2);
}