styles.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font: normal 13px sans-serif;
}

img {
    width: 35px;
}
.comment-section{
    list-style: none;
    max-width: 800px;
    width: 100%;
    margin: 50px auto;
    padding: 10px;
}

.comment{
    display: flex;
    border-radius: 3px;
    margin-bottom: 45px;
    flex-wrap: wrap;
}

.comment.user-comment{
    color:  #808080;
    justify-content: flex-end;

}

.comment.author-comment{
    color:  #60686d;
}

/* User and time message-info */

.comment .message-info{
    width: 17%;
}

.comment.author-comment .message-info{
    text-align: right;
}

.comment.user-comment .message-info{
    order: 3;
}


.comment .message-info a{	/* User name */
    display: block;
    text-decoration: none;
    color: #656c71;
    font-weight: bold;
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
    padding: 10px 0 3px 0;
}

.comment .message-info span{	/* Time */
    font-size: 11px;
    color:  #9ca7af;
}


/* The user avatar */

.comment .avatar{
    width: 8%;
}

.comment.author-comment .avatar{
    padding: 10px 18px 0 3px;
}

.comment.user-comment .avatar{
    order: 2;
    padding: 10px 3px 0 18px;
}

.comment .avatar img{
    display: block;
    border-radius: 50%;
}

.comment.author-comment .avatar img{
    float: right;
}





/* The comment text */

.comment p{
    line-height: 1.5;
    padding: 18px 22px;
    width: 50%;
    position: relative;
    word-wrap: break-word;
}

.comment.user-comment p{
    background-color:  #e2f8ff;

}

.comment.author-comment p{
    background-color:  #f3f3f3;
    order: 1;
}

.author-comment p:after{
    content: '';
    position: absolute;
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background-color: #ffffff;
    border: 2px solid #f3f3f3;
    left: -8px;
    top: 18px;
}

.user-comment p:after{
    content: '';
    position: absolute;
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background-color: #ffffff;
    border: 2px solid #e2f8ff;
    right: -8px;
    top: 18px;
}


/* Comment form */

.new-message{
    margin: 80px auto 0;
    width: 50%;
}

.new-message textarea{
    color:  #444;
    font: inherit;

    outline: 0;
    border-radius: 3px;
    border: 1px solid #cecece;
    background-color:  #fefefe;
    box-shadow: 1px 2px 1px 0 rgba(0, 0, 0, 0.06);
    overflow: auto;

    width:100%;
    min-height: 80px;
    padding: 15px 20px;
}

.new-message img{
    border-radius: 50%;
    margin-top: 15px;
}

.new-message button{
    float:right;
    background-color:  #87bae1;
    box-shadow: 1px 2px 1px 0 rgba(0, 0, 0, 0.12);
    border-radius: 2px;
    border: 0;
    color: #ffffff;
    font-weight: bold;
    cursor: pointer;

    padding: 10px 25px;
    margin-top: 18px;
}



footer {
    font: normal 16px Arial, Helvetica, sans-serif;
    padding: 15px 35px;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: #1B1F22;
    box-shadow: 0 -1px 1px rgba(0, 0, 0, 0.2);
    z-index: 1;
    text-align: left;
}

footer{
    color: #fff;
}
footer a{
    color: #ccc
}