How to Add a Separator/Border To Blogger Comments

Step 1. To add a simple separator go to Template > Edit HTML (check the "Expand Widget Templates" checkbox) and search for the following piece of code:

]]></b:skin>

Step 2. Then paste the following just above it:

- If we are using threaded comments (with the reply option):

.comment-block {
border-bottom: 1px solid #000000;
}

.comments .continue {
  border-top: 0px solid $(widget.alternate.text.color);
}

- If we are using previous commenting system (with no reply option)

#comments-block .comment-footer {
border-bottom:1px solid #000000;
}

Note: To change the border's color, replace the bolded color value and to change its thickness, increase/decrease the 1 value.

Step 3. Save the Template.

Instead of a simple border, we can also add a divider/image between our comments.

How to Add a Divider (Image) Between Each Comment in Blogger

Step 1. Go to Template > Edit HTML (check the "Expand Widget Templates" checkbox) and search for the following piece of code:

]]></b:skin>

Step 2. Paste the following just above it:

- If we are using threaded comments (with the reply option):

.comment-block {
background-image:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj-ce21tpZIq0UvX6rflOFyK5A-zCRB8fNu38-Mh92v3EwGY9Xtx9arop5Zor_Kn6tNh0fOg9DivIeoqoeqbyWbH9dcAKJU9IQFwKkHRLnFPA50KjZc2xHAUuTY7KoUi3o5p2hXWShsMXrj/s1600/74.gif);
background-repeat:no-repeat;
background-position:center bottom;
padding-bottom:30px;
margin-top: -10px;
}

.comments .continue {
border-top: 0px solid $(widget.alternate.text.color);
}

- If we are using previous commenting system (with no reply function)

#comments-block .comment-footer {
background-image:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj-ce21tpZIq0UvX6rflOFyK5A-zCRB8fNu38-Mh92v3EwGY9Xtx9arop5Zor_Kn6tNh0fOg9DivIeoqoeqbyWbH9dcAKJU9IQFwKkHRLnFPA50KjZc2xHAUuTY7KoUi3o5p2hXWShsMXrj/s1600/74.gif);
background-repeat:no-repeat;
background-position:center bottom;
height: 50px;
}

Note: The URL that is in blue represents the image that you can change as you like, just remember that at the height must set the height of an image with 30px more, for instance, if the image's height is 50px then the value will be 80px. This is for making sure that the image won't overlap the date of comments. (for threaded comments, increase/decrease the padding 30 value)

Step 3. Save the Template.

But you can still have more styles for each comment, for example adding a background color and a border.

How to Add A Border and A Background Color To Blogger Comments

Step 1. Go to Template > Edit HTML (check the "Expand Widget Templates" checkbox) and search for the following piece of code:

]]></b:skin>

Step 2. Paste the following just above it:

- If we are using threaded comments (with the reply option):

.comment-block {
background:#F9F9F9; /* Background Color */
border: 1px solid #f1f1f1; /* Border style */
margin-bottom:20px;
-webkit-box-shadow: 0 1px 2px rgba(0, 0, 0, .4);
-moz-box-shadow: 0 1px 2px rgba(0, 0, 0, .4);
box-shadow: 0 1px 2px rgba(0, 0, 0, .4);
-moz-border-radius: 10px;
-webkit-border-radius: 10px;
border-radius: 10px;
}

.comments .comment-thread.inline-thread {
background-color: #FAFAFA; /* Background color behind the replies */
border-left: 4px dotted #E6E6E6; /* Border on the left side of replies */
}

.comment-content {
padding:2px 10px 10px 10px;
color:#444444; /* Font Color in Comments */
}

.datetime a {
font-style:italic;
font-size:9px;
margin-left: 2px;
}

.comments .comments-content .user a{
color:#1982D1; /* Author's name color */
font-size: 12px; /* Author's name size */
padding-left: 10px;
font-weight:bold;
text-decoration:none;
}

.comments .comment .comment-actions a,.comments .comment .continue a{
display:inline-block;
margin:0 0 10px 10px;
padding:0 15px;
color:#B4B4B7;
text-align:center;
text-decoration:none;
background:#F8F8FB;
border:1px solid #C2C2C5;
border-radius:4px;
height:20px;
line-height:20px;
font-weight:normal;
cursor:pointer;
}

.comments .continue {
border-top: 0px solid $(widget.alternate.text.color);
}

.comments .comments-content .icon.blog-author {
background-image: none;
margin-left: -10px;
}

.comments .avatar-image-container{
margin: 0px 0px 0px 0px;
padding: 0px 0px 0px 0px;
width: 40px;
max-height: 40px;
border: 1px solid #F2F2F2;
padding: 1px;
}

.comments .avatar-image-container img{
margin: 0px 0px 0px 0px;
padding: 0px 0px 0px 0px;
max-width: 40px;
height: 40px;
}

Step 3. Save the Template.

- If we are using previous commenting system (with no reply function):

Step 1. Search for this line in your template:

<b:loop values='data:post.comments' var='comment'>

Step 2. Then, add the following code just below of it:

<div class='comments-ct'>

Step 3. Look a little further down and you'll see the </b:loop> code and just above it, add this:

</div>

Step 4. Now find this:

]]></b:skin>

Step 5. And just above of it, add this CSS code:

.comments-ct{
background:#F9F9F9; /* Background Color */
border: 1px solid #f1f1f1; /* Bprder Style */
margin-bottom:20px;
-webkit-box-shadow: 0 1px 2px rgba(0, 0, 0, .4);
-moz-box-shadow: 0 1px 2px rgba(0, 0, 0, .4);
box-shadow: 0 1px 2px rgba(0, 0, 0, .4);
-moz-border-radius: 10px;
-webkit-border-radius: 10px;
border-radius: 10px;
}

.comment-body {
color:#444444; /* Font Color in Comments */
padding:10px;
}

.comments-ct a {
padding-left: 5px; /* Link color */
color: #4A9BD8;
}

.comment-timestamp a {
font-style:italic;
font-size:9px;
padding-right:10px;
padding-left:10px;
}

(The rounded edges will not work in Internet Explorer with CSS)

In either case, you can change the background color, border, etc.. in parts with annotations in green.

Step 6. Save the Template.