Float left does not fit even so it should

Take container box of 100mm and fit in 4 float left 25mm boxes. They all should fit without shifting down.

Worked using px

<div style="width: 100mm">
  <div style="float: left; width: 25mm; height: 25mm; background: red">
  <div style="float: left; width: 25mm; height: 25mm; background: red">
  <div style="float: left; width: 25mm; height: 25mm; background: red">
  <div style="float: left; width: 25mm; height: 25mm; background: red">
</div>

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