HƯỚNG DẪN SỬ DỤNG:

Đăng nhập vào trang quản trị Blogger và thêm tất cả CSS này trước ]]></b:skin> nhé:

.comments h4{display:inline-block;position:relative;font-size:20px;color:#333;text-transform:none;font-weight:400;z-index:1;margin:0;}
.comments .comments-content{margin:0;padding:0}
.comments .comments-content .comment{margin-bottom:0;padding-bottom:0}
.comments .comments-content .comment:first-child{padding-top:0}
.facebook-tab,.fb_iframe_widget_fluid span,.fb_iframe_widget iframe{width:100%!important}
.comments .item-control{position:static;display:none}
.comments .avatar-image-container{float:left;overflow:hidden;position:absolute;padding:3px;background:#fff;border:1px solid #e1e1e1}
.comments .avatar-image-container,.comments .avatar-image-container img{height:35px;max-height:35px;width:35px;max-width:35px;border-radius: 50px;}
.comments .comment-block {
    overflow: hidden;
    padding: 10px;
    background: #ededed;
    display: inline-block;    border-radius: 10px;
}
.comments .comments-content .icon.blog-author:before {
    font-weight: 900;
    font-family: fontawesome;
    content: "\f00c";
    background: #ededed;
    display: inline-block;
    color: #0053f9;
    position: relative;
    top: 3px;
    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    border-radius: 50%;
    line-height: 13px;
    overflow: hidden;
    text-align: center;
    padding: 2px 4px 1px;
}
.comments .comment-block{margin-left:60px;}
.comments .comments-content .comment-replies{border-left:1px solid #e1e1e1;padding:0 0 0 23px}
.comment-replies{margin: 0;}
.comments .comments-content .inline-thread{padding:0}
.comments .comment-actions{float:right;position:relative}
.comments .comments-content .comment-header{color:#3D8FE8;font-size:16px;font-weight:400;display:block;overflow:hidden;clear:both;margin:0 0 10px;padding:0 0 5px;border-bottom:1pxsolid #D4D8DB}
.comments .comments-content .user{font-style:normal;font-weight:700;display:inline-block;font-size:15px}
.comments .blog-author a:after{display:inline-block;vertical-align:middle;content:"\f00c";font-family:"Font Awesome 5 Free";font-weight:700;padding:5px;margin:-7px 0 -5px4px;background:#ccc;color:#666;border-radius:50%;font-size:12px}
.comments .comments-content .comment-content{text-align:left;font-size:16px;line-height:normal;color:#111;margin:5px 0}
.comments .comment .comment-actions a{margin:0;color:#aaa;font-weight:400;font-size:12.5px;padding:0}
.comments .comment .comment-actions a:hover{color:#3b5998;text-decoration:none}
.comments .comments-content .datetime{color:#999;float:right;font-size:12px;position:relative;margin:0 0 010px;display:inline-block}
.comments .comments-content .comment-header a:hover{color:#3b5998}
.comments .thread-toggle{padding:0;margin:5px 0;display:none}
.comments .thread-toggle .thread-arrow{height:7px;margin:0 3px 2px 0}
.comments .thread-expanded{padding:0}
.comments .comments-content .comment-thread{margin:0}
.comment-thread ol{padding: 0;}
.comment-replies {    margin: 15px 0 0;    margin-left: 60px;}
.comments .continue a{padding:0 0 0 60px;font-weight:400;display:none}
.comments .comments-content .loadmore.loaded{margin:0;padding:0;display:none}
.comments .comment-replybox-thread{margin:0}

Lưu ý: Nhớ xóa toàn bộ CSS cũ nếu không sẽ bị lỗi nhé