style.css

html,
body {
    width: 100%;
    max-width: 100vw;
    height: 100%;
    margin: 0px;
    overflow: hidden;
    font-family: sans-serif;
    font-size: 20px;
    color: #e6e6e6;
    position: fixed;
    top: 0px;
    bottom: 0px;
    left: 0px;
    right: 0px;
}

body > div {
    width: inherit;
    height: inherit;
}

::-webkit-scrollbar {
    width: 0px;
    background: transparent;
}

h1 {
    margin: 0px;
    font-size: 30px;
}

.hide {
    display: none;
}

.header {
    display: table;
    position: absolute;
    height: 80px;
    width: 100%;
    box-sizing: border-box;
    text-align: left;
    font-weight: bold;
    border-bottom: solid 1px #FFFFFF;
    z-index: 1;
    color: #FFFFFF;
}

.header div {
    display: table-cell;
    position: relative;
    vertical-align: middle;
    background-color: #333333;
}

.header .left {
    width: 250px;
    text-align: center;
}

.header .middle {
    width: auto;
    text-align: center;
}

.header .right {
    width: 250px;
    height: inherit;
    min-height: 100%;
}

.header .right .video-sample-container {
    display: table;
    margin: auto;
    box-sizing: border-box;
}

.header video {
    height: 60px;
    border: solid 1px #e6e6e6;
}

.header img {
    height: 60px;
}

.online-list {
    float: left;
    width: 250px;
    height: 100%;
    overflow-y: scroll;
    position: absolute;
    box-sizing: border-box;
    padding-top: 80px;
    background-color: #1E2531;
}

.online-list div {
    width: 100%;
    height: 60px;
    text-align: left;
    background-color: #101620;
    box-sizing: border-box;
    cursor: pointer;
    border-bottom: solid 1px #6D7582;
}

.online-list img {
    height: 100%;
    border-radius: 50%;
    float: left;
    margin-right: 10px;
    padding: 10px;
    box-sizing: border-box;
}

.online-list span {
    display: block;
    position: relative;
    top: 50%;
    transform: translateY(-50%);
    word-break: break-all;
}

.chat {
    float: left;
    max-height: 100%;
    min-height: 100%;
    width: 100%;
    overflow-y: scroll;
    left: 250px;
    padding-left: 250px;
    padding-top: 80px;
    box-sizing: border-box;
    background-color: #363D48;
}

.log {
    height: 100%;
    width: 100%;
    margin-bottom: 50px;
}

.log div {
    padding: 8px;
}

.log b {
    color: #FFFFFF;
}

.input-container textarea {
    width: 100%;
    height: 100%;
    padding: 0px 5px;
    margin: 0px;
    box-sizing: border-box;
    line-height: 24pt;
    resize: none;
    outline: none;
    font-size: 14px;
    border: solid 1px #e6e6e6;
    background-color: #6D7582;
    border-radius: 3px;
    color: #FFFFFF;
    font-family: inherit;
}

.input-container textarea::placeholder {
    color: #FFFFFF;
    font-family: sans-serif;
}

div.input-container {
    position: fixed;
    bottom: 0px;
    height: 50px;
    width: 100%;
    background-color: #1E2531;
    box-sizing: border-box;
    padding-right: 250px;
}

.input-container div {
    display: inline-block;
    padding: 0px;
}

.input-container .textarea-container {
    width: 100%;
    height: 100%;
    padding: 8px 50px 8px 8px;
    box-sizing: border-box;
}

.input-container .submit {
    display: table;
    top: 0px;
    right: 250px;
    position: absolute;
    height: 100%;
    width: 50px;
    padding: 8px;
    box-sizing: border-box;
    fill: #FFFFFF;
    user-select: none;
    cursor: pointer;
}

.input-container .submit div {
    display: table-cell;
    height: 100%;
    vertical-align: middle;
    text-align: center;
}

.input-container .submit div svg {
    vertical-align: middle;
}

.video-modal {
    position: absolute;
    height: 100%;
    width: 100%;
    background-color: #000000;
}

.video-modal .close-video {
    position: absolute;
    display: flex;
    border-radius: 50%;
    background-color: #363D48;
    fill: #6D7582;
    padding: 1%;
    right: 1%;
    top: 1%;
    cursor: pointer;
    z-index: 1;
}

.video-modal img {
    position: absolute;
    width: 15%;
    bottom: 0px;
    right: 0px;
}

.video-modal video.me {
    position: absolute;
    width: 15%;
    bottom: 0px;
    right: 0px;
    border: solid 1px #e6e6e6;
}

.video-modal video.remote {
    display: block;
    height: 100%;
    max-width: 100%;
    margin: auto;
}

.modal-background {
    position: absolute;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    z-index: 2;
}

.user-input-modal h3 {
    margin: 15px auto;
}

.user-input-modal p {
    margin: 0px auto 20px auto;
}

.user-input-modal {
    position: relative;
    top: 50%;
    transform: translateY(-50%);
    max-width: 400px;
    min-width: 300px;
    overflow: hidden;
    margin: auto;
    padding: 15px;
    box-sizing: border-box;
    background-color: #363D48;
    border: solid 1px #e6e6e6;
    border-radius: 8px;
    color: #FFFFFF;
    text-align: center;
}

.user-input-modal .modal-button {
    display: inline-block;
    width: 100px;
    margin: 0px 10px 20px 10px;
    padding: 5px;
    box-sizing: border-box;
    background-color: #101620;
    color: #e6e6e6;
    border: solid 1px #6D7582;
    border-radius: 3px;
    user-select: none;
    cursor: pointer;
}

.user-input-modal .modal-button:hover {
    color: #FFFFFF;
    border: solid 1px #e6e6e6;
}

.user-input-modal .modal-button.disabled {
    opacity: 0.2;
}

.user-input-modal .modal-button.disabled:hover {
    color: #e6e6e6;
    border: solid 1px #6D7582;
}

.user-input-modal .modal-text-input {
    width: 80%;
    padding: 0px 5px;
    margin: 0px auto 20px auto;
    line-height: 24pt;
    outline: none;
    font-size: 14px;
    border: solid 1px #e6e6e6;
    background-color: #6D7582;
    border-radius: 3px;
    color: #FFFFFF;
    font-family: inherit;
    text-align: center;
}

.chat-interface {
    overflow: hidden;
}

@media only screen and (max-width: 700px) {
    h1 {
        font-size: 20px
    }

    html, body {
        font-size: 16px;
    }
}

@media only screen and (max-width: 450px) {
    .online-list,
    .header .right,
    .header .left {
        width: 100px;
    }

    .chat {
        left: 100px;
        padding-left: 100px;
    }

    div.input-container {
        height: 75px;
        padding-right: 100px;
    }

    .log {
        margin-bottom: 75px;
    }

    .input-container .submit {
        right: 100px;
    }

    .online-list img {
        height: 75%;
        margin: 6px 0px;
    }

    .video-modal .close-video {
        padding: 4%;
    }
}