Change the border height in CSS? - html

Question

I'm trying to set the left border of siginimage to 40px, but since the height of the signinimage is 25px, the border height is also being set as 25px.
.top-header {
float: left;
border-left: 2px solid #CCCCCC;
height: 30px;
margin-top: 0px;
}
#signinimage {
padding-top: 6px;
padding-left: 10px;
height: 25px;
width: 25px;
}
<img src="images/signinimage.png" class="top-header" id="signinimage">

Answer 1

Two approaches.
Either create a container and put the image inside it
In your question, you said you wanted to extend the border to the left
(but I mean that's just a matter of simple float:, but you can apply
this approach in general
img {
width: 100px;
height: 100px;
float: right;
}
#container {
border: 3px solid black;
width: 150px;
height: 100px;
}
<div id ="container">
<img src=https://i.imgur.com/QIsNrpM.png/>
</div>
The other alternative, if you insist on using only one element instead of two, you can set the image as a background-image of a differently sized div
#imganddiv {
border: 3px solid black;
width: 150px;
height: 100px;
background-image: url('https://i.imgur.com/QIsNrpM.png');
background-size: 100px 100px;
background-repeat: no-repeat;
background-position: right center;
}
<div id="imganddiv"></div>
I personally prefer the first option as it's a bit more intuitive and generally considered a common practice on to how containers (elements inside elements) should be handled.

Answer 2

To get a border taller than the image, you can wrap the image in a container, and apply the border to that container.
.top-header{
float: left;
border-left: 2px solid #CCCCCC;
height: 40px;
margin-top: 0px;
/* Center the image vertically */
display: flex;
align-items: center;
}
#signinimage{
height: 25px;
width: 25px;
padding-left: 10px;
}
<div class="top-header">
<img src="http://placekitten.com/25/25" id="signinimage">
</div>