bootstrap 4 four columns code example
Example 1: col offset in bootstrap
.col-md-3 .offset-md-3
Example 2: .col-12 bootstrap
.col-12{
flex: 0 0 100%;
max-width: 100%;
}
.col-md-3 .offset-md-3
.col-12{
flex: 0 0 100%;
max-width: 100%;
}