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HTML

            
              <h1>How to use flex to position two adjacent elements</h1>
<subtitle>One child with a minimum width, the other to fill the remaining space</subtitle>

<div class="parent">
  <div class="child--dynamic">85%</div>
  <div class="child--min">15%</div>
</div>

<div class="parent">
  <div class="child--dynamic">Subtotal</div>
  <div class="child--min">£1.23</div>
</div>

<div class="parent">
  <div class="child--dynamic">Subtotal</div>
  <div class="child--min">£1,234.34</div>
</div>

<h4>Problem:</h4>
<ul>
  <li>Two adjacent children within a parent container.</li>
  <li>One child has a fixed minimum width, but can expand if the contents overflow this <code>min-width</code> value.</li>
  <li>The second child fills the remaining space. This child shrinks in width if its sibling expands.</li>
</ul>

<p>The examples above show the minimum-width child on the right, and the dynamic width child on the left. The minimum-width of the child is 15%.</p>

<h4>Solution:</h4>

<ul>
  <li>Apply <code>display: flex</code> to the parent.</li>
  <li>Give the dynamically-sized child (the one that should shrink if necessary) <code>flex: 1</code>.</li>
  <li>Don't apply <code>flex</code> to the min-width child. It automatically sits adjacent to its sibling because its parent has <code>display: flex</code>. It will use the min-width value or resize to fit its contents if the contents overflow.</li>
</ul>

<p>Try experimenting with the contents of the fixed width child and see what happens to the width of the sibling.</p>

<p>Note that it's important to consider the potential contents of the dynamic child. How will it display if it contains a lot of contents? Or if the min-width sibling expands a lot? See <a href="https://codepen.io/claireparker/pen/MrWOwO">my other codepen</a>  for how to use an ellipsis to truncate long content.</p>
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CSS

            
              .parent {
  display: flex; /* This is all you need on the parent! The rest is for decoration. */
  width: 400px;
  border: 3px solid #EC407A;
  text-align: right;
  font-size: 18px;
  margin: 20px;
  padding: 3px;
}

.child--dynamic {
  flex: 1;
  border: 3px solid #4CAF50;
  padding: 3px;
}

.child--min {
  min-width: 15%;
  border: 3px solid purple;
  padding: 3px;
}

/* Codepen decoration */
body {
  background-color: #f6f6f6;
  color: #111;
}

code {
  font-family: monospace;
  background-color: #E0E0E0;
  padding: 0 5px;
}

li {
  line-height: 22px;
}

* {
  box-sizing: border-box;
  font-family: sans-serif;
}
!

JS
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