col div in bootstrap 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
.col-12{
flex: 0 0 100%;
max-width: 100%;
}
col-12 col-sm-4 col-md-3 col-lg-12 col-xl-12