Make flex children inline-block [duplicate]

Question

I would like to have the flex children rendered inline-block so that border-bottom is under the li's width instead of the container's width.

Apparently flex children can't be set as inline-block?

Is there a workaround to this problem?

.menu {
  display: flex;
  flex-flow: column;
  list-style: none;
  padding: 0;
}
.menu > li {
  display: inline-block;
  margin-bottom: 1rem;
  border-bottom: 3px solid black;
}

<ul class="menu">
  <li>Tab 1</li>
  <li>Tab 2</li>
  <li>Tab 3</li>
</ul>

https://codepen.io/joshuajazleung/pen/EbwZmJ

Answer 1

Add align-items: flex-start to the container:

.menu {
  display: flex;
  flex-flow: column;
  align-items: flex-start; /* NEW */
  list-style: none;
  padding: 0;
}
.menu > li {
  margin-bottom: 1rem;
  border-bottom: 3px solid black;
}

<ul class="menu">
  <li>Tab 1</li>
  <li>Tab 2</li>
  <li>Tab 3</li>
</ul>

OR... switch from display: flex to display: inline-flex.

.menu {
  display: inline-flex;
  flex-flow: column;
  list-style: none;
  padding: 0;
}
.menu > li {
  margin-bottom: 1rem;
  border-bottom: 3px solid black;
}

<ul class="menu">
  <li>Tab 1</li>
  <li>Tab 2</li>
  <li>Tab 3</li>
</ul>

More details here: Make flex items take content width, not width of parent container