Hi!
1. In this case, I believe this is probably the best custom CSS to do it:
[html].asp_content h3 {
display: block !important;
margin-top: 23px !important;
}[/html]
2. You mean changing the placeholder styling? It is inherited from the input styling (as set under the Theme Options -> Typography panel), but that custom CSS looks fine as well. Make sure to add the other browser alternatives as well:
[html]div.asp_m.asp_m_1 .probox .proinput input.orig::-webkit-input-placeholder {
color: #686868;
font-weight: 300;
}
div.asp_m.asp_m_1 .probox .proinput input.orig:focus:-ms-input-placeholder {
color: #686868;
font-weight: 300;
}[/html]