jitsi-meet/css/_chat.scss

#chat-conversation-container {
    // extract message input height
    height: calc(100% - 64px);
    overflow: hidden;
    position: relative;
}

#chatconversation {
    box-sizing: border-box;
    flex: 1;
    font-size: 10pt;
    height: 100%;
    line-height: 20px;
    overflow: auto;
    padding: 16px;
    text-align: left;
    word-wrap: break-word;

    display: flex;
    flex-direction: column;

    & > :first-child {
        margin-top: auto;
    }

    a {
        display: block;
    }

    a:link {
        color: rgb(184, 184, 184);
    }

    a:visited {
        color: white;
    }

    a:hover {
        color: rgb(213, 213, 213);
    }

    a:active {
        color: black;
    }
}

.chat-input-container {
    padding: 0 16px 24px;
}

#chat-input {
    display: flex;
    align-items: flex-end;
    position: relative;
}

.chat-input {
    flex: 1;
    margin-right: 8px;
}

#nickname {
    text-align: center;
    color: #9d9d9d;
    font-size: 16px;
    margin: auto 0;
    padding: 0 16px;

    label[for="nickinput"] {
        > div > span {
            color: #B8C7E0;
        }
    }
    input {
        height: 40px;
    }

    label {
        line-height: 24px;
    }
}

.mobile-browser {
    #nickname {
        input {
            height: 48px;
        }
    }

    .chatmessage .usermessage {
        font-size: 16px;
    }
}

.chatmessage {
    &.error {
        border-radius: 0px;

        .timestamp,
        .display-name {
            display: none;
        }

        .usermessage {
            color: #ffffff;
            padding: 0;
        }
    }

    .messagecontent {
        max-width: 100%;
        overflow: hidden;
    }
}

#smileys {
    font-size: 20pt;
    margin: auto;
    cursor: pointer;
}

#smileys img {
    width: 22px;
    padding: 2px;
}

.smiley-input {
    display: flex;
    position: absolute;
    top: 0;
    left: 0;
}

.smileys-panel {
    bottom: 100%;
    box-sizing: border-box;
    background-color: rgba(0, 0, 0, .6) !important;
    height: auto;
    display: flex;
    overflow: hidden;
    position: absolute;
    width: calc(#{$sidebarWidth} - 32px);
    margin-bottom: 5px;
    margin-left: -5px;

    /**
     * CSS transitions do not apply for auto dimensions. So to produce the css
     * accordion effect for showing and hiding the smiley-panel, while allowing
     * for variable panel, height, use a very large max-height and animate off
     * of that.
     */
    transition: max-height 0.3s;

    #smileysContainer {
        background-color: $chatBackgroundColor;
        border-top: 1px solid #A4B8D1;
    }
}

#smileysContainer .smiley {
    font-size: 20pt;
}

.smileyContainer {
    width: 40px;
    height: 40px;
    display: inline-block;
    text-align: center;
}

.smileyContainer:hover {
    background-color: rgba(255, 255, 255, 0.15);
    border-radius: 5px;
    cursor: pointer;
}

.chat-message-group {
    &.local {
        align-items: flex-end;

        .display-name {
            display: none;
        }

        .timestamp {
            text-align: right;
        }
    }

    &.error {
        .display-name {
            display: none;
        }
    }
}

.chat-dialog {
    display: flex;
    flex-direction: column;
    height: 100%;
    margin-top: -5px; // Margin set by atlaskit.

    &-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin: 16px;
        width: calc(100% - 32px);
        box-sizing: border-box;
        color: #fff;
        font-weight: 600;
        font-size: 24px;
        line-height: 32px;

        .jitsi-icon {
            cursor: pointer;
        }
    }

    #chatconversation {
        width: 100%;
    }
}


/**
 * Make header close button more easily tappable on mobile.
 */
.mobile-browser .chat-dialog-header .jitsi-icon {
    display: grid;
    place-items: center;
    height: 48px;
    width: 48px;
    background: #36383C;
    border-radius: 3px;
}