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Layout break

So I am working on a little ui-kit and I've made alerts and for some odd reason they stretch their parent container.

You can see the layout here http://johnweland.github.io/cltsd/

if you dismiss the alert in the side bar you can see the sidebar container shrink to the width its supposed to be. You can find the code here. https://github.com/johnweland/cltsd

But for example my alerts sass is as follows.

.alert {
  max-width: 100%;
  padding-left: 0.857em; // distance to match that of .alert__trigger.
  display: flex;
  justify-content: space-between;
  align-items: center;

.alert__trigger {
  align-self: flex-start;
  width: 40px;
  min-height: 40px;
  display: flex;
  justify-content: center;
  align-items: center;

@each $theme, $color in $ui-colors {
  .alert--#{$theme} {
    background-color: $color;
    color: $white;

I've done some more testing and text seems to push my flex boxes wider instead of said text breaking and wrapping.

update ::

[class^="site-"] {
  margin: .3em;
  flex-basis: 0; // Fixes odd layout issue... Hack?
  flex-grow: 1;

setting flex-basis to 0 seems ot fix the issue, though I'm not sure if that is a hack or proper coding....