html - 如何将div的末尾放置在容器的左侧

我正试图显示一个浮动气泡，其中一条消息位于气泡的左侧，我已经使用绝对定位并为left属性设置了一个固定值。但是，当消息文本更改时，div宽度将减小/扩大，并从气泡中移开。
我应该如何定位它，使浮动消息保持在气泡的左侧，而不考虑文本？
代码如下：

var floatingMessage = document.querySelector("#floating-message");
var toggleBtn = document.querySelector("#toggleMessage");
var messages = ["Hello There 👋, chat with us!", "Hello There 👋", "Welcome!", "blah blah", "looooooooooooooooooooonoooooooooooooog text"];
var currentIndex = 0;
toggleBtn.addEventListener('click', function() {
    currentIndex = (currentIndex + 1) % messages.length;
    floatingMessage.textContent = messages[currentIndex];
});

body {
  font-family: calibri;
  background-color: lightgray;
}
#floating-bubble {
    background-color: teal;
    position: fixed;
    bottom: 0;
    right: 0;
    margin-bottom: 20px;
    margin-right: 20px;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    box-shadow: 0 0 20px rgba(0,0,0,.5);
    transition: box-shadow .5s ease-in-out;
    cursor: pointer;
    z-index: 2147483645;
    border-bottom-right-radius: 0;
    background-image: url('https://cdn0.iconfinder.com/data/icons/thin-communication-messaging/57/thin-036_bubble_comment_chat_message-512.png');
    background-position: center;
    background-size: 80%;
    background-repeat: no-repeat;
    border-bottom-right-radius: 0;
}
#floating-message {
  background: #3a96dd;
    padding: 5px;
    left: -180px;
    transition: none;
    animation-duration: .5s;
    animation-name: slidein,wiggle;
    animation-iteration-count: 1,4;
    animation-direction: normal,alternate;
    animation-timing-function: ease-in,ease-in-out;
    border-radius: 10px;
    top: 10px;
    font-size: 14px;
    box-shadow: 0 0 10px #000;
    position: absolute;
    color: #fff;
    font-family: Calibri, sans-serif;
}

<button id="toggleMessage">
Toggle Message
</button>
<div id="floating-bubble">
<div id="floating-message">Hello There 👋, chat with us!</div>
</div>

Fiddle

最佳答案

很简单，用这个：
对于#floating-message使用right: 60px（60px，因为50px正在由#floating-bubble使用）并删除left样式，这样消息将粘贴到屏幕的末尾，但现在它有时会分成两行，因此要修复此问题，请使用white-space: nowrap。
另外，我认为在2147483645中为z-index使用#floating-bubble是多余的，我已经将其更改为2，以防其他元素有1。

var floatingMessage = document.querySelector("#floating-message");
var toggleBtn = document.querySelector("#toggleMessage");
var messages = ["Hello There 👋, chat with us!", "Hello There 👋", "Welcome!", "blah blah", "looooooooooooooooooooonoooooooooooooog text"];
var currentIndex = 0;
toggleBtn.addEventListener('click', function() {
    currentIndex = (currentIndex + 1) % messages.length;
    floatingMessage.textContent = messages[currentIndex];
});

body {
  font-family: calibri;
  background-color: lightgray;
}
#floating-bubble {
    background-color: teal;
    position: fixed;
    bottom: 0;
    right: 0;
    margin-bottom: 20px;
    margin-right: 20px;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    box-shadow: 0 0 20px rgba(0,0,0,.5);
    transition: box-shadow .5s ease-in-out;
    cursor: pointer;
    z-index: 2;
    border-bottom-right-radius: 0;
    background-image: url('https://cdn0.iconfinder.com/data/icons/thin-communication-messaging/57/thin-036_bubble_comment_chat_message-512.png');
    background-position: center;
    background-size: 80%;
    background-repeat: no-repeat;
    border-bottom-right-radius: 0;
}
#floating-message {
  background: #3a96dd;
    padding: 5px;
    right: 60px;    /* Added right over here, so that message stick to the end of screen */
    white-space: nowrap; /* Added this over here, so that it forces the message to be in single line */
    transition: none;
    animation-duration: .5s;
    animation-name: slidein,wiggle;
    animation-iteration-count: 1,4;
    animation-direction: normal,alternate;
    animation-timing-function: ease-in,ease-in-out;
    border-radius: 10px;
    top: 10px;
    font-size: 14px;
    box-shadow: 0 0 10px #000;
    position: absolute;
    color: #fff;
    font-family: Calibri, sans-serif;
}

<button id="toggleMessage">
Toggle Message
</button>
<div id="floating-bubble">
<div id="floating-message">Hello There 👋, chat with us!</div>
</div>