.step-flex{
    display: flex;
    align-items: center;
    justify-content: center;
    
}
.step-flex img{
    padding: 0;
    width: 300px;
}

@media (max-width: 600px){
    .step-flex img{
        width: 200px;
        height: 250px;
    }
    
}
@media (max-width: 450px){
    .step-flex img{
        width: 150px;
        height: 200px;
    }
    
}