How to display hr horizontally with flex?

Question

When using flexbox for styling, if the parent container is set to display: flex it will cause the

---

to be displayed vertically instead o

Answer 1

The reason for this is that default value of align-items is stretch so hr will get the same height as largest element in flex-container or in this case h2. And default value for justify-content is flex-start so width of hr is 0.

Easy way to fix this is to use flex-wrap: wrap on parent element and flex: 0 0 100% on hr

.container {
  display: flex;
  flex-wrap: wrap;
}
hr {
  flex: 0 0 100%;
}

  
Test