Align H1 Header and Normal Text in Same Line

Question

I\'m trying to have a H1 header and regular text on the same line, with a line under it, like so:

Answer 1

Original answer (still working just fine)

See this CodePen.

The idea is to make the

inline to allow the second text to be at the same line.

HTML:

  
Text
  text2

CSS:

header { border-bottom: 1px solid #000; }
header > h1 { display: inline-block; }
header span { margin-left: 100px; }

2020 Update

See this alternative CodePen that makes use of flexbox.

Instead of setting the h1 to an inline-block, you can make the header a flex container. A flex container will (by default) layout its children on a horizontal axis. Note that you also need align-items: center to keep the h1 and span on the same vertical axis.

Also, note that you might want align-items: baseline if you want the texts to appear on the same baseline (like my original answer).

header {
  display: flex;
  align-items: center;

  /* Remove the next line if you want the span to appear next to the h1 */
  justify-content: space-between;

  border-bottom: 1px solid #000;
  padding: 10px 30px;
}