#postnavigation {
      width: 100%;
      float:left;
}
#previouspost {
      width: 50%;
      float: left;
      text-align: center;
}
#nextpost {
      width: 50%;
      float: right;
      text-align: center
}

#depcomdrop{
 width:100px;   
}
#depcomdrop option{
  width:100px;   
}