div.landing_page_block_div
{
    margin-top:100px;
    display:inline-block;
    width:100%;
}

div.landing_page_sub_block_div
{
    margin-top:30px;
    width:300px;
    margin:auto;
}
div.landing_page_sub_block_div > div
{
    margin-bottom:30px;
}
input.landing_page_input
{
    width:100%;
}