@media only screen and (max-width: 1920px) {
    .chat-box .conversion-left,.chat-box .conversion-right{
        width: 100%;
    }
	.chat-box .conversion-left .dialog-chat,.chat-box .conversion-right .dialog-chat{max-width:70%}
}
@media only screen and (max-width: 991px) {
    .chat-box .conversion-left,.chat-box .conversion-right{
        width: 100%;
    }
	.chat-box .conversion-left .dialog-chat,.chat-box .conversion-right .dialog-chat{max-width:60%}
}