javascript - margin collapsed without giving margin bottom -


enter image description here

as can see above, if don't give margin-bottom on 2017/08/17, won't show child tag.... used margin auto won't work either.

i deleted margin bottom 150px , result below

enter image description here

<div class="chat-box-single-line">   <abbr class="timestamp" >2017/08/17</abbr>    <div class="chatmsg">bla</div>    <div class="chatmsg">bla</div> </div> <div class="chat-box-single-line">  <abbr class="timestamp" >2017/08/18</abbr>    <div class="chatmsg">bla</div>    <div class="chatmsg">bla</div>    <div class="chatmsg">bla</div>    <div class="chatmsg">bla</div> </div>


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