make div and image vertically align inside a div - html

Question

<div class="outside" style="width: 500px; height: 20px; border: 1px solid red;">
<img src="" style="width: 10px; height: 20px; margin: 0; padding: 0; display: inline-block;">
<div id="here" style="display: inline-block; height: 15px; border: 1px solid blue; font-size: 7px;">11</div>
</div>
I found bottom line of img and #here do not in a line, if I add any text to #here, who can tell me why.
And how to make the #here and img verticall center in the outside (img and #here in the same line )

Answer 1

vertical-align is what you are looking for.
.outside > * {
vertical-align: middle;
}
<div class="outside" style="width: 500px; height: 20px; border: 1px solid red;">
<img src="http://www.fillmurray.com/20/10" style="width: 10px; height: 20px; margin: 0; padding: 0; display: inline-block;">
<div id="here" style="display: inline-block; height: 15px; border: 1px solid blue; font-size: 7px;">11</div>
</div>

Answer 2

Do you want it in the horizontal center?
#ImageCtr {
width: 10px;
height: 20px;
}
#outer {
width: 500px;
height: 20px;
background-color: #FF0000;
display: flex;
align-items: center;
justify-content: center;
}
<div id="outer">
<div id="ImageCtr"><img src="http://i.imgur.com/vCVDBHB.png">
</div>
</div>