position: absolute; и используйте margin. Вот пример:<section class="cen" id="cen">
<div class="knpk">
<a href="#ostzav" class="button"/>Оставить</a>
</div>
</section>.cen {
background: blue;
width: 200px;
height: 200px;
}
.knpk {
background: green;
width: 100px;
height: 30px;
line-height: 30px;
text-align: center;
position: absolute;
margin-top: 50px;
margin-left: 20px;
}
int n=5;
#if (n < 3)
std::cout << "TRUE";
return 0;
#endif