CSS challenge: Using two div and contenteditable div to Create a 凸 shape - html

Question

I want to create something like the picture, where the #body is between #leg1 and #leg2, three of them should be horizontally in line to the bottom. Any idea how to achieve this? I tweaked some property such as display:inline, or float:left, float:right, but none of them work as I expect.
.comment_leg {
s width: 60px;
/*height:18px;*/
background-color: #ffcc99;
padding: 5px;
text-align: center;
border-radius: 3px;
}
[contenteditable=true]:empty:before {
content: attr(placeholder);
display: block;
For Firefox
}
#body {
background-color: white;
/*position:relative;*/
border: 1px solid orange;
/*height:60px;*/
width: 500px;
padding: 10px;
color: black;
border-radius: 3px;
font-size: 18px;
/*border-color:yellow;*/
}
#body:focus {
outline-style: solid;
outline-color: orange;
outline-width: 0px;
}
<br>
<br>
<br>
<div class="comment_leg">leg1</div>
<div id="body" contenteditable="true" autocomplete="off" spellcheck="false" placeholder="Pika pi?"></div>
<div class="comment_leg">leg2</div>

Answer 1

From what I understood of your "凸" shape I guess this is what you want:
NOTE: You can adjust height and width depending on your preference.
.comment_leg {
width: 60px;
/*height:18px;*/
background-color: #ffcc99;
padding: 5px;
text-align: center;
border-radius: 3px;
vertical-align: bottom;
display: inline-block;
}
[contenteditable=true]:empty:before {
content: attr(placeholder);
display: block;
For Firefox
}
#body {
background-color: white;
border: 1px solid orange;
min-height:100px;
width: 150px;
padding: 10px;
color: black;
border-radius: 3px;
font-size: 18px;
display: inline-block;
vertical-align: bottom;
}
#body:focus {
outline-style: solid;
outline-color: orange;
outline-width: 0px;
}
<div class="comment_leg">leg1</div>
<div id="body" contenteditable="true" autocomplete="off" spellcheck="false" placeholder="Pika pi?"></div>
<div class="comment_leg">leg2</div>