I am trying to re-size the Teaser component but I'm not able to do it. For reference please find the below screenshot.
Can you check the nodes for grid setting for teaser component after resizing or the HTML DOM e.g.
<div class="teaser aem-GridColumn--default--none aem-GridColumn aem-GridColumn--default--6 aem-GridColumn--offset--default--0">
Can you please specify below as well -
Which versoin of AEM are you using ?
Try verifying the below configuration of Clientlib required to make this happen:
Let me know if it doesn't work, faced and resolved it some days back.