.flexBox{
display : flex;
flex-wrap:nowrap;
}

.flexBox > div{
margin-top : 0!important;
flex-basis: 350px;
padding : 0 0.5em;
margin-bottom : 1em;
}


@media screen and (max-width:767px) {

.flexBox{
display : flex;
flex-direction: column;
flex-wrap:nowrap;
}

.flexBox > div{
margin-top : 0!important;
flex-basis: auto;
padding : 0 0.5em;
margin : 0 auto 1em;
}

}