bootstrap4 弹性盒子-等宽

.flex-fill 类强制设置各个弹性子元素的宽度是一样的:

<div class="d-flex"> <div class="p-2 bg-info flex-fill">Flex item 1</div> <div class="p-2 bg-warning flex-fill">Flex item 2</div> <div class="p-2 bg-primary flex-fill">Flex item 3</div>

</div>