vue 实现点击选中div 右下角显示对号√

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效果图：

<div class="" style="display: flex;">
	<div class="item" :class="activeKey === 0 ? 'select' : ''" @click="activeKey = 0">
			<div class="shift">
				早班 8：00 - 20：00
			</div>
			<div class="">
				2022年07月18日
			</div>
	</div>
	<div class="item" :class="activeKey === 1 ? 'select' : ''" @click="activeKey = 1">
		<div class="shift">
			晚班 20：00 - 8：00
		</div>
		<div class="">
			2022年07月18日
		</div>
	</div>
</div>

.item {
		border: 1px #AAAAAA solid;
		padding: 1vh 1vw;
		border-radius: 5px;
		margin: 1vh 1vw;
	}

	.shift {
		font-weight: 600;
		margin-bottom: 10px;
	}

	.select {
		position: relative;
		text-align: left;
		color: #00aaff;
		background-color: #fff;
		box-shadow: 0px 2px 7px 0px rgba(85, 110, 97, 0.35);
		border-radius: 5px;
		border: 1px solid #00aaff;
	}

	.select:before {
		content: '';
		position: absolute;
		right: 0;
		bottom: 0;
		border: 10px solid #00aaff;
		border-top-color: transparent;
		border-left-color: transparent;
	}

	.select:after {
		content: '';
		width: 4px;
		height: 6px;
		position: absolute;
		right: 4px;
		bottom: 3px;
		border: 2px solid #fff;
		border-top-color: transparent;
		border-left-color: transparent;
		transform: rotate(45deg);
	}


		border-left-color: transparent;
		transform: rotate(45deg);
	}