#blackboard{
  position: absolute;;
  left:230px;
   top:120px; 
 }
 #blackboard1{
  position: absolute;;
  left:230px;
   top:120px; 
   visibility: hidden;
 }
#titlos{
   position: absolute;;
   left:130px;
    top:20px; 
}
 #odigies{
    position: absolute;;
    left:820px;
     top:140px; 
 }
 #CuCl{
 position: absolute;;
 left:53px;
  top:469px; 
  cursor: pointer;
}
#NH3{
    position: absolute;;
    left:195px;
     top:469px; 
    cursor: pointer;
   }
   #gas{
    position: absolute;;
    left:335px;
     top:542px; 
    cursor: pointer;
   }
   #cup{
    position: absolute;;
    left:637px;
     top:522px; 
   }
   #cupUp{
    position: absolute;;
    left:672px;
     top:526px; 
   }
   #tube{
    position: absolute;;
    left:709px;
     top:494px; 
   }
   #line{
    position: absolute;;
    left:679px;
     top:585px; 
   }
   #button{
    position: absolute;;
    left:658px;
    top:653px; 
    cursor: pointer;
   }
   #mesure{
    position: absolute;;
    left:677px;
     top:538px; 
   }
   #wire{
    position: absolute;;
    left:387px;
     top:469px; 
   }
   #canvasTube{
    position: absolute;;
    left:712px;
     top:547px; 
   }
   #canvas1{
    position: absolute;;
    left: 712px;
     top:547px; 
 }
 #production{
  position: absolute;;
  left: 832px;
   top:510px; 
}
#start{
  position: absolute;;
  left:20px;
   top:700px; 
   cursor: pointer;
}