parent-style.css

.chatterbox-iframe {
    position: fixed;
    right: 20px;
    bottom: 100px;
    border: none;
    /*
     this is to prevent the display of the smaller iframe before it is resized
     programmatically.
    */
    height: 0;
    width: 0;
}

@media (max-width: 800px) {
    .chatterbox-iframe {
        bottom: 0;
        right: 0;
    }
}

.start {
    position: fixed;
    right: 20px;
    bottom: 15px;
}

.start-chat-btn {
    width: 64px;
    height: 64px;
    border: none;
    border-radius: 100%;
    cursor: pointer;
    background: no-repeat center url('./ui/res/chat-bubbles.svg'), linear-gradient(180deg, #7657F2 0%, #5C56F5 100%);
    box-shadow: 0px 1px 3px rgba(0, 0, 0, 0.1), 0px 12px 32px -2px rgba(0, 0, 0, 0.2);
}

.start-background-minimized {
    background: no-repeat center url("./ui/res/chevron-down-button.svg"), linear-gradient(180deg, #7657F2 0%, #5C56F5 100%);
}