#txt_chat {
    width: 100%;
    height: 50px;
    border-left: 0px;
    border-right: 0px;
    border-top: 1px solid #3C8DBC;
}

#txt_chat:focus,#txt_search_chat:focus {
    outline: none;
}

#txt_tim_kiem:focus{
    outline:none;
}

.txt_tim_kiem:focus{
    outline:none;
}