#content{
  position: relative;
  background-color: transparent; 
}

#content::after {
  content: "";
  background-size:     cover;                        
  background-repeat:   no-repeat;
  background-position: center center;              

  opacity: 1.0;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  position: absolute;
  z-index: -1;   
}

#exercise{  
  max-width: 1000px;
  min-height: 800px; 
}

/*#exercise{   
  padding-top:20px;  
  clear:both;
  overflow: hidden;  
  max-width: 1000px; 
  margin: 0px auto;       
  min-height:600px;
  text-align: center;        
  background-color: transparent;
  border:0px;
}
*/
#exercise .tlacitko-control{
  display: inline-block;
  margin: 5px;  
  margin-top: 20px;
  font-size: 18px;    
  width: 150px;      
  text-align:center;  
  border-radius:2px;  
  line-height: 50px;  
  cursor: pointer;

  background-color: #e0e0e2;
  color: #34495E;   
}

#exercise .tlacitko-control:hover{ 
  color:white; 
  background-color:#2ecc71; 
}

#exercise .tlacitko-control.disabled{ 
  color:white;
  background-color:#e6e8ea;  
}

#exercise #sentence{      
  font-size: 22px;  
  line-height: 1.5em;  
  text-align: left;      
  padding: 20px 40px;
  
  color: #34495E;   
  font-weight: 400;
  background-color: white;
  border-radius: 3px;
  display: inline-block;  
  max-width: 800px;
  box-shadow: 0px 0px 32px 0px rgba(0,0,0,0.1);

}

#exercise #pool{  
  margin-top:50px;
}

#exercise .poolBox{  
  border:0px solid red;
  margin:10px;  
  display:inline-block;
}

#exercise .wordBox{
  width: 200px;
  margin:5px;
  display:inline-block;    
  height:35px;      
  background-color: #ecf0f1;
  border-radius: 5px;
  
}

#exercise .word{
  width: 200px;
  font-size: 18px; 
  display:inline-block;    
  padding:0px;
  height:35px;
  line-height:35px;   
  color: white;  
  cursor: pointer;
  background-color: #3498db;  
  border-radius: 5px;
}

#exercise .wordCorrect{
    background-color: #00ca65;
}
#exercise .wordWrong{
    background-color: #e74c3c;
}

#exercise #explanation{
  font-size: 18px;
  line-height: 28px;
  margin:10px;
  margin-top: 20px;


  font-weight: 400;
  background-color: white;
  border:1px solid #2980b9;
  border-radius: 3px;
  padding:10px;
  text-align: left;
  display: none;
  box-shadow: 0px 0px 32px 0px rgba(0,0,0,0.1);
}

#exercise #explanation.whiteScreen{
  box-shadow: 0px 0px 32px 0px rgba(0,0,0,0);
}

#exercise .gap{
  text-decoration: underline;
}

/********************** WHITE SCREEN *****************************/
#exercise.whiteScreen{ 

}

#exercise.whiteScreen #sentence{ 
  box-shadow: 0px 0px 32px 0px rgba(0,0,0,0); 
}

/********************** MOBILNI VERZE *****************************/

@media screen and (max-width: 550px) {
  #exercise #sentence{      
    font-size: 22px;  
    line-height: 1.5em;  
    text-align: left;
    padding: 10px 10px;
  }  
  #exercise .word{
    width: 120px;
  }
  #exercise .wordBox{
    width: 120px;
  }
  #exercise #pool{
    margin-top:10px;
  }
  #exercise .poolBox{    
    margin:5px;  
    display:inline-block;
  }
}