@media screen and (max-width:650px) {
    .chat_box {
        width:100%;
        left:0px;
        margin-left:0;
    }

    .chat_box input {
        box-shadow:0px 0px 0px transparent !important;
        border-radius:0px !important;
        border-left:0px !important;
        border-right:0px !important;
    }

    #history {
        width:100%;
    }

    .text_container {
        width:100%;
    }
}