body {
    text-align: center;
}
.card-deck{
	margin-top: 60px;
}
.card-body{
	-webkit-box-flex: 1;
    -ms-flex: 1 1 auto;
    flex: 1 1 auto;
    padding: 1.25rem;
}
.card-header{
	padding: .75rem 1.25rem;
    margin-bottom: 0;
    background-color: rgba(0,0,0,0.03);
    border-bottom: 1px solid rgba(0,0,0,0.125);
}
@media screen and (max-width 900px){
    header{display: none;}
}