How do I stop my blocks moving?

Question

On small device screens and sometimes on large screens the blocks move when I click on them
https://code.sololearn.com/WlARMeXrobj8/?ref=app

Answer 1

.row{
display: flex;
flex-direction: row;
width:290px;
margin: 100px auto 100px auto;
}
.col-sm-3{
display: flex;
flex-direction: column;
}