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CSS CSS Layout The CSS Box Model Margin

Why is the height of the content in the header 18.125px?

Anwar's (the instructor) has a content height of 18px.

header {
  background-color: blue;
  color: ghostwhite;
  border: 12px solid gray;
  padding: 20px 15px;
Steven Parker
Steven Parker
229,017 Points

When does it become 18.125px? If you're measuring something you've done in the workspace, make a snapshot of your workspace and post the link to it here.