body {
    margin-left: auto;
    margin-right: auto;
    background-color: #000000;
}

#stred {
    background-color: black;
    margin: 0px auto;
    position: relative;
    top: 40px;
    width: 980px;
}

#anorganika {
    background-color: black;
    margin: 0px auto;
    position: absolute;
    top: 0px;
    width: 240px;
}

#organika {
    background-color: black;
    margin: 0px auto;
    position: absolute;
    top: 0px;
    width: 240px;
    left: 740px;
}

#koutek {
    background-color: black;
    margin: 0px auto;
    position: relative;
    top: 140px;
    width: 320px;
    height: 600px;
}

.centrovany {
    text-align: center;
    color: white;
}

a.button1 {
          background: #f0ce46;
	  border-radius: 5px;
          box-shadow: 0 -2px #000000 inset;
          padding: 7px 8px;
	  font-weight: 700;
	  font-size: 18px;
          font-family: Arial;
          text-decoration: none;
	  text-transform: none;
	  text-shadow: 0px 1px 1px rgba(0,0,0,0.3);
	  color: #000000;

}

a.button1:hover {background: blue;
                 color: #ffffff;}