#obsah {
  position: absolute;
  width: 520px;
  top: 140px;
  left: 200px; 
}
#patka {
  width: 100%;
}
#hlavicka {
  position: absolute;
  width: 900px;
  top: 20px;
  left: 20px;
  height: 120px;
}
#levy {
  position: absolute;
  width: 180px;
  top: 140px;
  left: 20px;
}
#pravy {
  position: absolute;
  width: 180px;
  top: 140px;
  left: 740px;
}
#levy {
  background-color: green;
  color: white;
  border-style: none;
  border-width: medium;
}
#levy h3 {
  color: black;
}
#levy a:link {
  color: yellow;
}
#levy a:visited {
  color: silver;
}
#levy a:hover {
  color: red;
}
#pravy {
  background-color: green;
  color: white;
  border-style: none;
  border-width: medium;
}
#hlavicka, #patka {
  background-color: navy;
  color: yellow;
  border-style: none;
  border-width: medium;
}
#vtipek {
  position: absolute;
  width: 100px;
  top: 90px;
  left: 570px;
  height: 100px; 
  text-align: center;
  background-color: yellow;
  z-index: 1; 
  border-style: none; border-width: medium;
}
#vtipek {
  filter: Alpha(opacity=90, style=3);
  -moz-opacity: 0.9;
  opacity: 0.9;
}
div {
  padding: 6px;
}
/** {
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}*/