Проясните по CSS

#form {
  background-color: #000;
  opacity: 1.0;
  color: #F38639;
  display: none;
  width: 250px;
  position: absolute; 
  float: top;
  left: 10px;
  top: 30px;
  border-top-left-radius: 10px;
  border-top-right-radius: 10px;
  border-bottom-left-radius: 10px;
  border-bottom-right-radius: 10px;
}

#wrap {
  opacity: 0.85;
  background-color: #000000;
  color: #ffffff;
  font-size: 0.8em;
  margin: 0 auto;
  max-width: 1000px;
  min-width: 900px;
  min-height: 800px;
  position: relative;
  top: 30px;
  overflow-x:hidden;
  padding: 0 3px 3px 3px;
  text-align: left;
  border-top-left-radius: 10px;
  border-top-right-radius: 10px;
}

<script type=text/javascript language=JavaScript>
<!--
function q3_onclick() {
  document.getElementById('form').style.display='block'
}