.chatMessage{
font-size:16px;
}
.chatHeader {
    background-image: url(https://image.ibb.co/jPO3HH/bg.png);
    background-size: cover;
    background-repeat: no-repeat;
height:80px;
}
.chatMain{
top:81px
}
.chatHeader .chatTopLine{
top:30px
}