<style>
    html,
    body {
        position: relative;
        height: 100%;
        margin: 0;
        padding: 0;
    }

    .description {
        padding: 10px;
    }

    .root {
        position: relative;
    }

    .container {
        position: relative;
        margin-top: 50px;
    }

    .target {
        position: absolute;
        width: 100px;
        height: 100px;
        top: 150px;
        left: 100px;
        line-height: 100px;
        text-align: center;
        background: #ee8;
   