*,
*:before,
*:after {
    box-sizing: border-box;
}

ul,
li {
    list-style-type: none;
}

.info_box {
    border-style: solid;
    border-radius: 5px;
    border-color: rgb(194, 193, 196);
    margin-top: 0px;
    margin-bottom: 0px;
    background-color: rgb(255, 255, 255);
}

.chatroom_wrapper {
    border-style: solid;
    border-radius: 5px;
    border-color: rgb(196, 194, 193);
    margin-top: 0px;
    margin-bottom: 3px;
    background-color: rgb(255, 255, 255);
}

.chatroom_wrapper ul {
    width: 50%;
    margin: 0 auto;
    height: 300px;
    overflow-x: hidden;
    overflow-y: auto;
    padding-right: 30px;
}

.chatroom_wrapper ul li {
    margin-bottom: 20px;
    padding: 10px 20px;
    position: relative;
    border-radius: 10px;
    font: 1em/1.6 "arial";
    clear: both;
}

.chatroom_wrapper .info {
    float: center;
    margin-top: 20px;
    margin-bottom: 40px;
    margin-left: 70px;
    margin-right: 10px;
    border-radius: 5px;
    color: rgb(0, 0, 0);
    background-color: rgb(225, 239, 216);
}

.chatroom_wrapper .bot {
    float: left;
    margin-left: 70px;
    margin-right: 90px;
    background-color: rgb(255, 242, 204);
}

.chatroom_wrapper .user {
    float: right;
    margin-left: 160px;
    margin-right: 10px;
    background-color: rgb(198, 222, 242);
}

.chatroom_wrapper ul li:before,
.chatroom_wrapper ul li:after {
    position: absolute;
    content: "";
}

.chatroom_wrapper ul li:before {
    width: 45px;
    height: 45px;
    top: 0;
    border-radius: 50%;
    background-position: 50% 50%;
    background-repeat: no-repeat;
}

.chatroom_wrapper ul li:after {
    width: 0;
    height: 0;
    top: 15px;
    border-top: 15px solid transparent;
}

.chatroom_wrapper .bot:after {
    left: -15px;
    border-top-color: rgb(255, 242, 204);
    border-left: 15px solid transparent;
}

.chatroom_wrapper .user:after {
    right: -15px;
    border-top-color: rgb(198, 222, 242);
    border-right: 15px solid transparent;
}

@media only screen and (min-width: 768px) {
    .chatroom_wrapper ul {
        width: 100%;
        height: 480px;
    }

    .chatroom_wrapper .info:before {
        left: -70px;
        background-image: url("/media/info.png");
    }

    .chatroom_wrapper .bot:before {
        left: -70px;
        background-size: 50px;
    }
}

@media only screen and (max-width: 767px) {
    .info_box img {
        height: 50px;
    }

    header {
        display: none;
    }

    footer {
        display: none;
    }

    .info_box {
        border-width: thin;
    }

    .chatroom_wrapper {
        border-width: thin;
        padding: 0px;
    }

    .chatroom_wrapper ul {
        width: 100%;
        height: 75vh;
    }

    .chatroom_wrapper .info {
        margin-top: 10px;
        margin-bottom: 20px;
        margin-left: 0px;
        margin-right: 0px;
    }

    .chatroom_wrapper .bot {
        margin-left: 0px;
        margin-right: 15px;
    }

    .chatroom_wrapper .user {
        margin-left: 15px;
        margin-right: 0px;
    }
}

.chatroom_input {
    resize: none;
    overflow-y: auto;
    scrollbar-color: transparent transparent;
}

.chatroom_input::-webkit-scrollbar {
    width: 4px;
}

.chatroom_input::-webkit-scrollbar-thumb {
    background-color: rgb(196, 194, 193);
    border-radius: 3px;
}