bootstrap columns css code example

Example 1: .col-12 bootstrap

.col-12{
	flex: 0 0 100%;
	max-width: 100%;
}

Example 2: bootstrap grid class

col-12 col-sm-4 col-md-3 col-lg-12	col-xl-12

Example 3: .row bootstrap

.row{
    display: flex;
    flex-wrap: wrap;
	margin-right: -15px;
    margin-left: -15px;
}