#blackboard{
  position: absolute;;
  left:200px;
   top:120px; 
 }
 #blackboard1,#blackboard2,#blackboard3,#blackboard4,#blackboard1a,#blackboard2a,#blackboard3a,#blackboard4a{
    position: absolute;;
    left:200px;
     top:120px; 
     visibility: hidden;
   }
 #stand{
    position: absolute;;
    left:730px;
     top:556px; 
 }
 #standUp{
    position: absolute;;
    left:733px;
     top:570px; 
 }
 #tube1{
    position: absolute;;
    left:777px;
     top:493px; 
 }
 #canvasTube1{
    position: absolute;;
    left: 783px;
     top:511px; 
 }
 #canvas1{
    position: absolute;;
    left: 783px;
     top:590px; 
 }
 #canvasNa1 {
    position: absolute;;
    left: 792px;
     top:511px; 
 }
 #tube2{
    position: absolute;;
    left:844px;
     top:493px; 
 }
 #canvasTube2{
    position: absolute;;
    left: 850px;
     top:512px; 
 }
 #canvas2{
    position: absolute;;
    left: 848px;
     top:590px; 
 }
 #canvasNa2 {
    position: absolute;;
    left: 856px;
     top:511px; 
 }
 #tube3{
    position: absolute;;
    left:911px;
     top:493px; 
 }
 #canvasTube3{
    position: absolute;;
    left: 917px;
     top:512px; 
 }
 #canvas3{
    position: absolute;;
    left: 917px;
     top:590px; 
 }
 #canvasNa3 {
    position: absolute;;
    left: 921px;
     top:511px; 
 }
 #tube4{
    position: absolute;;
    left:978px;
     top:493px; 
 }
 #canvasTube4{
    position: absolute;;
    left: 984px;
     top:512px; 
 }
 #canvas4{
    position: absolute;;
    left: 982px;
     top:590px; 
 }
 #canvasNa4 {
    position: absolute;;
    left: 989px;
     top:511px; 
 }
 #tube1a{
    position: absolute;;
    left:787px;
     top:504px; 
 }
 #tube2a{
    position: absolute;;
    left:852px;
     top:504px; 
 }
 #tube3a{
    position: absolute;;
    left:919px;
     top:504px; 
 }
 #tube4a{
    position: absolute;;
    left:986px;
     top:504px; 
 }
 #pedinio{
    position: absolute;;
    left:44px;
     top:475px; 
     cursor: pointer;
 }
 #CH3CH2OH{
    position: absolute;;
    left:166px;
     top:475px; 
     cursor: pointer;
 }
 #fenoli{
    position: absolute;;
    left:288px;
     top:475px; 
     cursor: pointer;
 }
 #CH3COOH{
    position: absolute;;
    left:405px;
     top:475px; 
     cursor: pointer;
 }
 #Na{
    position: absolute;;
    left:537px;
     top:596px; 
     cursor: pointer;
 }
#titlos{
   position: absolute;;
   left:60px;
    top:20x; 
}
#indi{
    position: absolute;;
    left:632px;
     top:620px; 
     cursor: pointer;
 }
 #odigies{
    position: absolute;;
    left:820px;
     top:70px; 
 }
 #water{
    position: absolute;;
    left:1112px;
     top:445px; 
     cursor: pointer;
 }
 #start{
    position: absolute;;
    left:20px;
     top:710px; 
     cursor: pointer;
  }
  #production{
   position: absolute;
   left:685px;
   top:710px
}