這是效果圖~

html程式碼：

    <div class="bubbleDiv">
        <div class="bubbleItem">     <!--左側的泡泡-->
            <span class="bubble leftBubble">
                老師，你好！
                <span class="bottomLevel"></span>
                <span class="topLevel"></span>
            </span>
        </div>


        <div class="bubbleItem clearfix">   <span style="font-family: Arial, Helvetica, sans-serif;"><!--右側的泡泡--></span>
            <span class="bubble rightBubble">
                老師，你好！
                <span class="bottomLevel"></span>
                <span class="topLevel"></span>
            </span>
        </div>


        <div class="bubbleItem">
            <span class="bubble leftBubble">
                老師，你好！
                <span class="bottomLevel"></span>
                <span class="topLevel"></span>
            </span>
        </div>


        <div class="bubbleItem">
            <span class="bubble leftBubble">
                老師，你好！
                <span class="bottomLevel"></span>
                <span class="topLevel"></span>
            </span>
        </div>
    </div>
 

css程式碼：

        .bubbleDiv{
            width: 1000px;
            margin: 0 auto;
            height: 1000px;
            border: 1px solid #4a4f58;
        }
        .bubbleItem{
            width: 100%;
        }
        .bubble{
            max-width: 655px;
            position: relative;
            line-height: 30px;
            padding-left: 10px;
            padding-top: 3px;
            padding-bottom: 3px;
            border-radius: 7px;
            margin-top: 15px;
            padding-right: 10px;
            display: inline-block;
        }
        .leftBubble{
            position: relative;
            margin-left: 25px;
            border: 1px solid #00b6b6;
            background-color: #f8fdfc;
        }
        .leftBubble .bottomLevel{
            position: absolute;
            top: 10px;
            left: -10px;
            border-top: 10px solid #00b6b6;
            border-left: 10px solid transparent;
        }
        .leftBubble .topLevel{
            position: absolute;
            top: 11px;
            left: -8px;
            border-top: 10px solid #f8fdfc;
            border-left: 10px solid transparent;
            z-index: 100;
        }
        .rightBubble{
            position: relative;
            margin-right: 25px;
            float: right;
            border: 1px solid #aaa;
        }
        .rightBubble .bottomLevel{
            position: absolute;
            bottom: 11px;
            right: -10px;
            border-bottom: 10px solid #aaa;
            border-right: 10px solid transparent;
        }
        .rightBubble .topLevel{
            position: absolute;
            bottom: 12px;
            right: -8px;
            border-bottom: 10px solid #fff;
            border-right: 10px solid transparent;
            z-index: 100;
        }
        .clearfix:after {
            visibility: hidden;
            display: block;
            font-size: 0;
            content: " ";
            clear: both;
            height: 0;
        }