Sidebar Blog List Smaller

 Making the Blog List Widget to appear like the Archive and Labels in the side menu: 

This is in the BlogList1 widget.

<b:includable id='main'>
                        
<!-- added -->
<details class='collapsible extendable'>
<summary>
<div class='collapsible-title'>

  <b:include name='widget-title'/>
    
<!-- added -->
<svg class='svg-icon-24 chevron-down'>
<use xlink:href='/responsive/sprite_v1_6.css.svg#ic_expand_more_black_24dp' xmlns:xlink='http://www.w3.org/1999/xlink'/>
</svg>
<svg class='svg-icon-24 chevron-up'>
<use xlink:href='/responsive/sprite_v1_6.css.svg#ic_expand_less_black_24dp' xmlns:xlink='http://www.w3.org/1999/xlink'/>
</svg>
</div>
</summary>

  <b:include name='content'/>

  <!-- added -->
</details>

</b:includable>