style2.css

@import url(https://fonts.googleapis.com/css?family=Lato:400,700);
*, *:before, *:after {
    box-sizing: border-box;
}

.container {
    margin: 0 auto;
    width: 100%;
    height: 100%;
    background: #444753;
    border-radius: 5px;
}

.chat {
    height: 100%;
    width: 100%;
    background: #F2F5F8;
    border-top-right-radius: 5px;
    border-bottom-right-radius: 5px;
    color: #434651;
}
.chat .chat-header {
    padding: 20px;
    border-bottom: 2px solid white;
}
.chat .chat-header img {
    float: left;
}
.chat .chat-header .chat-about {
    float: left;
    padding-left: 10px;
    margin-top: 6px;
}
.chat .chat-header .chat-with {
    font-weight: bold;
    font-size: 16px;
}
.chat .chat-header .chat-num-messages {
    color: #92959E;
}
.chat .chat-header .fa-star {
    float: right;
    color: #D8DADF;
    font-size: 20px;
    margin-top: 12px;
}
.chat .chat-history {
    padding: 30px 30px 20px;
    border-bottom: 2px solid white;
    overflow-y: scroll;
    height: 400px;
}
.chat .chat-history .message-data {
    margin-bottom: 15px;
}
.chat .chat-history .message-data-time {
    color: #a8aab1;
    padding-left: 6px;
}
.chat .chat-history .message {
    color: white;
    padding: 18px 20px;
    line-height: 26px;
    font-size: 16px;
    border-radius: 7px;
    margin-bottom: 30px;
    width: 70%;
    position: relative;
}
.chat .chat-history .message:after {
    bottom: 100%;
    left: 7%;
    border: solid transparent;
    content: " ";
    height: 0;
    width: 0;
    position: absolute;
    pointer-events: none;
    border-bottom-color: #86BB71;
    border-width: 10px;
    margin-left: -10px;
}
.chat .chat-history .my-message {
    background: #86BB71;
}
.chat .chat-history .other-message {
    background: #94C2ED;
}
.chat .chat-history .other-message:after {
    border-bottom-color: #94C2ED;
    left: 93%;
}
.chat .chat-message {
    padding: 30px;
}
.chat .chat-message textarea {
    width: 100%;
    border: none;
    padding: 10px 20px;
    font: 14px/22px "Lato", Arial, sans-serif;
    margin-bottom: 10px;
    border-radius: 5px;
    resize: none;
}
.chat .chat-message .fa-file-o, .chat .chat-message .fa-file-image-o {
    font-size: 16px;
    color: gray;
    cursor: pointer;
}
.chat .chat-message button {
    float: right;
    color: #94C2ED;
    font-size: 16px;
    text-transform: uppercase;
    border: none;
    cursor: pointer;
    font-weight: bold;
    background: #F2F5F8;
}
.chat .chat-message button:hover {
    color: #75b1e8;
}

.online, .offline, .me {
    margin-right: 3px;
    font-size: 10px;
}

.online {
    color: #86BB71;
}

.offline {
    color: #E38968;
}

.me {
    color: #94C2ED;
}

.align-left {
    text-align: left;
}

.align-right {
    text-align: right;
}

.float-right {
    float: right;
}

.clearfix:after {
    visibility: hidden;
    display: block;
    font-size: 0;
    content: " ";
    clear: both;
    height: 0;
}