* {

margin: 0;

padding: 0;

}

​

#wrapper1 {

  border: 3px solid orange;

  background-color: red;

  position: relative;

  left: 50%;

  overflow: auto;

}

​

#wrapper2 {

  background-color: gray;

  border: 0px solid;

  position: relative;

  left: -50%;

​

}

​

#nav {

  background-color: blue;

}

​

#column1 {

  background-color: yellow;

    float: left;

}

​

#column2 {

  background-color: green;

  float: left;

}