#c1 {
	margin: 100px auto 50px auto;
}
#c2 {
	margin: 0 0 50px 0;
}
#c3 {
	margin: 0 0 100px 0;
}
@media screen and (min-width: 469px) and (max-width: 768px){
#c1 {
}
#c2 {
}
#c3 {
}
}
@media screen and (max-width: 468px){
#c1 {
}
#c2 {
}
#c3 {
}
}