css如何完成长方形中一个小直角梯形？

利用clip-path的polygon函数进行裁剪就很容易做到

HTML部分

<div class="container">
        <div class="status">空闲</div>
        <div class="number">3<span>台</span></div>
    </div>

CSS部分

.container {
            width: 600px;
            height: 300px;
            background-color: #FFD900;
            border-radius: 20px;
            position: relative;
        }
        .container .status {
            text-align: right;
            color: #fff;
            margin: 50px 50px 0;
            font-size: 40px;
            font-weight: 700;
        }
        .container .number {
            width: 580px;
            height:280px;
            position: absolute;
            top: 10px;
            left: 10px;
            background-color: #fff;
            z-index: 2;
            display: flex;
            align-items: flex-end;
            font-weight: 700;
            font-size: 40px;
            padding-left: 50px;
            padding-bottom: 50px;
            box-sizing: border-box;
            clip-path: polygon(0% 0%,30% 0px,70% 50%,100% 50%,100% 100%,0 100%);
        }
        .container .number span {
            color: #ddd;
            margin-left: 30px;
        }