Cambiar caja de comentarios

Buscamos este codigo /* Comments

----------------------------------------------- */

borramos todo lo que esta abajo de el... hasta donde cierre la ultima llavecita "}" y pegamos este codigo:

.comments{clear:both;margin-top:10px;margin-bottom:0;line-height:18px;font-size:13px}
.comments .comments-content{margin-bottom:16px;font-weight:normal;text-align:left}
.comments .comment .comment-actions a,.comments .comment .continue a{
display:inline-block;
margin:0 0 10px 10px;
padding:0 15px;
color:#999 !important; /*--- Color de la fuente del boton de Responder--- */
text-align:center;
text-decoration:none;
background: #FFD3EF;  /*--- color del fondo del boton de responder--- */
background: -webkit-gradient( linear, left top, left bottom, color-stop(.2, white), color-stop(1, #E5E5E5) ); /*--- color del fondo del gradiente--- */
background: -moz-linear-gradient( center top, white 20%, #E5E5E5 100% );/*--- color del fondo del gradiente--- */
border:1px solid #6AD5FF;  /*---color borde boton responder--- */
border-radius:5px;
-moz-border-radius:5px;
height:26px;
line-height:28px;
font-weight:normal;
cursor:pointer;
}
.comments .comment .comment-actions a:hover,.comments .comment .continue a:hover {
text-decoration: none;
background:#fff; /*--- Color fondo boton responder hover--- */
border:1px solid #E781FF; /*--- color borde boton responder hover--- */
}
.comments .comments-content .comment-thread ol{
list-style-type:none;padding:0;text-align:none}
.comments .comments-content .inline-thread{padding:0}
.comments .comments-content .comment-thread{margin:8px 0}
.comments .comments-content .comment-thread:empty{display:none}
.comment-replies{margin-top:1em;margin-left:40px;}
.comments .comments-content .comment{margin-bottom:0;padding-bottom:0}
.comments .comments-content .comment:first-child{padding-top:16px}
.comments .comments-content .comment:last-child{border-bottom:0;padding-bottom:0}
.comments .comments-content .comment-body{position:relative;
}
.comments .comments-content .user{font-style:normal;font-weight:normal}
.comments .comments-content .user a{font-weight:normal;text-decoration:none;}
.comments .comments-content .icon.blog-author{
background-repeat: no-repeat;
  background-image: url(http://i1190.photobucket.com/albums/z449/_KawaiiCherryCupCake_/Annyz_Blog/minigifsbyannyzblog218.gif);
width:20px;
height:20px;
display:inline-block;
margin:0 0 -4px 6px;
float:right;
}
.comments .comments-content .datetime a{
font-size:11px;
float:right;
text-decoration:none; color:#B2E2FF; /* --  color del link de la fecha de comentario-- */
}
.comment-content{margin:0 0 8px;padding:0 5px;
}
.comments .comment-block{
margin-left:65px;
position:relative;
background:#fff; /* -- color de fondo de la caja de comentario-- */
border:3px solid #FFD6EC; /* --- color de borde de la caja de comentario---*/
border-radius:8px;
-moz-border-radius:8px;
}
.comment-header{ /*--- Link o nombre del autor de los comentarios--- */
background-color:#ffffff;   /*--- color de fondo--- */
font-size:18px;
border-bottom:1px solid #FFD6EC;  /*--- color de borde --- */
padding:5px;
}
.comment-header a{
color: $(link.color); /*--- color de link de nombre del autor comentarios--- */
}
.comments .comments-content .owner-actions{position:absolute;right:0;top:0}
.comments .comments-replybox{border:none;height:230px;width:100%}
.comments .comment-replybox-thread{margin-top:0}
.comments .comment-replybox-single{margin-top:5px;margin-left:48px}
.comments .comments-content .loadmore a{display:block;padding:10px 16px;text-align:center}
.comments .thread-toggle{cursor:pointer;display:inline-block}
.comments .comments-content .loadmore{cursor:pointer;max-height:3em;margin-top:0}
.comments .comments-content .loadmore.loaded{max-height:0;opacity:0;overflow:hidden}
.comments .thread-chrome.thread-collapsed{display:none}
.comments .thread-toggle{display:inline-block}
.comments .thread-toggle .thread-arrow{
display:inline-block;
height:6px;
width:7px;
overflow:visible;
margin:0.3em;
padding-right:4px;
}
.comments .thread-expanded .thread-arrow{background:url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAc AAAAHCAYAAADEUlfTAAAAG0lEQVR42mNgwAfKy8v/48I4FeA0AacVDFQBAP9wJkE/KhUMAAAAAElFTkSuQmCC") no-repeat scroll 0 0 transparent;
}
.comments .thread-collapsed .thread-arrow{background:url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAA AcAAAAHCAYAAADEUlfTAAAAJUlEQVR42mNgAILy8vL/DLgASBKnApgkVgXIkhgKiNKJ005s4gDLbCZBiSxfygAAAAB JRU5ErkJggg==") no-repeat scroll 0 0 transparent;
}
.avatar-image-container{
background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj76onGX4FxpNbzYJedIkxDkNTNp0WvP840yQPoW4YUkXO5fTCXjWf4s_TeGhmFq1rhrBMhpp6I6KGl4QNI3XiLA_4lyH3RPqJ02RF9Xsi5GpYVAVVVShIkBs3PFjGafKpWwHisgf6pXRo/s1600/imagem-arrow.png) top right no-repeat; /*--- imagen flechita---*/
float:left
vertical-align:middle;
overflow:hidden;
width:65px !important;
height:51px !important;
max-width:65px !important;
max-height:51px !important}
.comments .avatar-image-container img{
padding:2px;
border:1px double #FFB3E6;
width:45px !important;
height:45px !important
;max-width:45px !important;
max-height:45px !important;
}

ejemplo:

luego dan guardar y es todo solo falta que ustedes personalizen las cajitas a su gusto :)

creditos:Annys