What causes a block element to not stretch to match the width of its parent when it is in a fixed position?

I am currently developing a fixed horizontal navigation bar that spans the entire width of the screen. However, when I attempt to make its position fixed, the unordered list element only occupies the width required to contain its content.

Considering that the unordered list is naturally a block element, why doesn't it automatically expand to the full width?

Answer №1

Elements with a fixed position will occupy the space of their content regardless of their display settings. To extend it to fit the content, the left and right properties must be specified:

#myelement {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
}

By doing this, the element will stay fixed at the top and span the entire width of the container.

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