CSS mouseover effect

Effect picture:
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CSS

    <style>
        @import url('https://fonts.googleapis.com/css?family=Poppins:100,200,300,400,500,600,700');

        body {
            margin: 0;
            padding: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            font-family: 'Poppins', sans-serif;
            height: 100vh;
            background: #333;
        }

        ul {
            margin: 0;
            padding: 0;
            display: flex;
        }

        ul li {
            position: relative;
            list-style: none;
            width: 20px;
            height: 20px;
            background: #777;
            margin: 0 20px;
            border-radius: 50%;
            transition: 0.5s;
            cursor: pointer;
        }
        /* 核心代码 */
        ul li:hover {
            background: #86ff3b;
            box-shadow: 0 0 0 4px #333,
                0 0 0 6px #86ff3b;
        }

        ul li .content::before {
            content: '';
            position: absolute;
            width: 30px;
            height: 30px;
            background: #fff;
            bottom: -15px;
            left: 194px;
            transform: rotate(45deg);
        }

        ul li .content h2 {
            margin: 0;
            padding: 0;
        }

        ul li .content {
            position: absolute;
            bottom: 55px;
            width: 400px;
            background: #fff;
            padding: 20px;
            box-sizing: border-box;
            border-radius: 4px;
            visibility: hidden;
            opacity: 0;
            transition: 0.5s;
            transform: translateX(-50%) translateY(-50px);
        }

        ul li:hover .content {
            visibility: visible;
            opacity: 1;
            transform: translateX(-50%) translateY(0px);
        }
    </style>

HTML

<body>
    <ul>
        <li>
            <div class="content">
                <h2>周一</h2>
                <p>洗衣服</p>
            </div>
        </li>
        <li>
            <div class="content">
                <h2>周二</h2>
                <p>拖地</p>
            </div>
        </li>
        <li>
            <div class="content">
                <h2>周三</h2>
                <p>抹桌子</p>
            </div>
        </li>
    </ul>
</body>

CSS mouseover effect

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