#canvasBlackboard{
  position: absolute;;
  left:206px;
   top:120px; 
 }
 #blackboard1,#blackboard2,#blackboard3,#blackboard4,#blackboard1a,#blackboard2a,#blackboard3a,#blackboard4a{
    position: absolute;;
    left:200px;
     top:120px; 
     visibility: hidden;
   }
 #stand{
    position: absolute;;
    left:730px;
     top:559px; 
 }
 #standUp{
    position: absolute;;
    left:733px;
     top:573px; 
 }
 #tube1{
    position: absolute;;
    left:779px;
     top:493px; 
 }
 #canvasTube1{
    position: absolute;;
    left: 785px;
     top:584px; 
 }
 #canvas1{
    position: absolute;;
    left: 785px;
     top:592px; 
 }
 #canvas1a{
   position: absolute;;
   left: 785px;
    top:537px; 
}
 #canvasNa1 {
    position: absolute;;
    left: 785px;
     top:662px; 
 }
 #tube2{
    position: absolute;;
    left:879px;
     top:493px; 
 }
 #canvasTube2{
    position: absolute;;
    left: 886px;
     top:584px; 
 }
 #canvas2{
    position: absolute;;
    left: 886px;
     top:592px; 
 }
 #canvas2a{
   position: absolute;;
   left: 884px;
    top:537px; 
}
 #canvasNa2 {
    position: absolute;;
    left: 883px;
     top:662px; 
 }
 #tube3{
    position: absolute;;
    left: 974px;
     top:493px; 
 }
 #canvasTube3{
    position: absolute;
    left: 980px;
     top:584px; 
 }
 #canvas3{
    position: absolute;;
    left: 980px;
     top:592px; 
 }
 #canvas3a{
   position: absolute;;
   left: 979px;
    top:537px; 
}
 #canvasNa3 {
    position: absolute;;
    left: 980px;
     top:662px; 
 }
 #tube1a{
    position: absolute;;
    left:787px;
     top:504px; 
 }
 #tube2a{
    position: absolute;;
    left:888px;
     top:504px; 
 }
 #tube3a{
    position: absolute;;
    left:982px;
     top:504px; 
 }
 #CH3COOH{
    position: absolute;;
    left:73px;
     top:469px; 
     cursor: pointer;
 }
 #NaHCO3{
    position: absolute;;
    left:190px;
     top:591px; 
     cursor: pointer;
 }
 #Na2CO3{
    position: absolute;;
    left:280px;
     top:591px; 
     cursor: pointer;
 }
 #CaCO3{
    position: absolute;;
    left:370px;
     top:591px; 
     cursor: pointer;
 }
 #indicator{
   position: absolute;;
   left:460px;
    top:611px; 
    cursor: pointer;
}
#water{
   position: absolute;;
   left:530px;
    top:515px; 
    cursor: pointer;
}
#titlos{
   position: absolute;;
   left:30px;
    top:20px; 
}
 #odigies{
    position: absolute;;
    left:820px;
     top:120px; 
 }
 #production{
   position: absolute;;
   left:320px;
    top:700px; 
}
#start{
    position: absolute;;
    left:20px;
     top:700px; 
     cursor: pointer;
 }