CSS div width not working

display: flex on the parent element also changes how width and height work. Disable shrinking/growing by flex: 0 0 auto;, or use min-width and max-width instead.

Width and height basically lose the original meaning and will act as a flex-basis, see geddski: The Difference Between Width and Flex Basis 

.box {
  margin: 2px;
  border: 1px solid black;
  padding: 3px;
}
.box.gray {
  background: lightgray;
}
.box.container {
  display: flex;
  flex-flow: row;
}
<div class="box" style="
  width: 300px;
  font-size: 80%;
">
  <div>
      width: 300px;
  </div>
  <div class="box container">
    <div class="box gray" style="width: 200px;">
      width: 200px;
    </div>
    <div class="box gray" style="width: 200px;">
      width: 200px;
    </div>
  </div>

  <div class="box container">
    <div class="box gray" style="
      width: 200px;
      flex: 0 0 auto;
    ">
      width: 200px;<br>
      flex: 0 0 auto;
    </div>
    <div class="box gray" style="width: 200px;">
      width: 200px;
    </div>
  </div>

</div>

Try

display:block

It should work

Tags:

Css

Width

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