css粘性定位超出指定宽度失效问题

展示效果

解决办法：外层容器添加display:grid即可

完整代码

<template>
    <div class="box">
        <div class="line" v-for="items in 10">
		    <div class="item" v-for="item in 8">drgg</div>
        </div>
    </div>
</template>
<style scoped lang="scss">
    .box{
        width: 400px;
        height: 200px;
        overflow: auto;
        display: grid;
    }
    .line {
        display: flex;
    }
    .item{
        width: 100px;
        border: 1px solid;
        flex: none;
        &:first-child {
            position: sticky;
            left: 0;
            background-color: aliceblue;
        }
    }
</style>