converse.js/sass/inverse/_minimized_chats.scss

#conversejs.fullscreen {
    #minimized-chats {
        border-top-left-radius: $chatbox-border-radius;
        border-top-right-radius: $chatbox-border-radius;
        color: $inverse-link-color;
        display: none;
        float: right;
        font-weight: bold;
        height: 100%;
        margin: 0 $chat-gutter;
        padding: 0;
        width: 130px;

        #toggle-minimized-chats {
            border-top-left-radius: $chatbox-border-radius;
            border-top-right-radius: $chatbox-border-radius;
            background-color: $link-color;
            color: white;
            position: relative;
            padding: 10px 0 0 0;
            display: block;
            width: 100%;
            height: 100%;
            text-align: center;
        }

        .minimized-chats-flyout {
            height: auto;
            bottom: $bottom-gutter-height;
            .chat-head {
                padding: 0.3em;
                border-radius: $chatbox-border-radius;
                width: $minimized-chats-width;
                height: 35px;
                margin-bottom: 0.2em;
                box-shadow: 1px 3px 5px 3px rgba(0, 0, 0, 0.4);
            }
            &.minimized {
                height: auto;
            }
        }

        .unread-message-count {
            font-weight: bold;
            background-color: white;
            border: 1px solid;
            text-shadow: 1px 1px 0 $text-shadow-color;
            color: $warning-color;
            border-radius: 5px;
            padding: 2px 4px;
            font-size: 16px;
            text-align: center;
            position: absolute;
            right: 116px;
            bottom: 10px;
        }
    }
}