bootstrap4中自带flex的css类

bootstrap4采用flex布局，一些css样式默认自带flex。也就是说在使用以下css的时候，不用在添加d-flex来定义flex，可以直接在里边添加flex属性(justify-content等）。

.row

.form-row
.form-inline
.form-inline .form-group
.form-inline .form-check

.btn-toolbar
.input-group
.input-group > .custom-file
.input-group-prepend
.input-group-append
.input-group-text

.nav
.navbar
.navbar > .container
.navbar > .container-fluid
.navbar-nav

.card
.card-deck
.card-group

.breadcrumb
.pagination

.progress
.progress-bar

.media

.list-group

.modal-dialog-centered
.modal-content
.modal-header
.modal-footer

.carousel-control-prev
.carousel-control-next
.carousel-indicators

转载于:https://www.cnblogs.com/chrisbao/p/9133250.html