Post Info Causing Layout Shift

Hi

Im trying to fix my blog speed using lighthouse tool and chrome dev tool
i receive a warning a failed element with large layout shifts

I have no idea what causing this but im guessing it's my CSS(i hope someone kind enough to point the fault on my css )

This is the detail on chrome dev tool

and this is my CSS

.post-info{
display:block;
padding:3px 0;
color:#666;
line-height:1.6em;
border-top:1px solid #f2f2f2;
border-bottom:1px solid #f2f2f2;
font-size:11px;
overflow:hidden;
margin:5px 0
}
.post-info a{
color:#666
}

Can anyone help me please