body{
 background:  radial-gradient(circle, rgb(48, 178, 221), rgb(11, 105, 176));
   background-repeat: no-repeat;
  background-attachment: fixed;
  background-position: center;
  background-size: cover;

  display: flex;
  justify-content: center; /* horizontaal centreren */
  align-items: center; 
    height: 100vh;           /* hele schermhoogte */
  margin: 0;       /* verticaal centreren */
}

#container{
  position: relative;
  width: 90%;
  max-width: 1000px;
  display: flex;
  align-self: center;
min-height: 500px;
 align-items: center;
 justify-content: center;
 flex-direction: column;




  justify-self: center;
  
}
#box{
  width: 100%;
  max-width: 800px;
  
}


#input-container{
  width: 100% ;
 
  display: flex;
  gap: 10px;
  margin-bottom: 10px;
 justify-content: space-evenly;
 
  
}

#startPauzeren{
align-items: end;
width: 100%;
justify-content: space-evenly;
  gap: 10px;

  display: flex;

}

#timer{

   font-size:clamp(60px, 20vw, 200px);
   color: white;
}

.tijd-menu,.knop{
  outline: none;
  border: none;
  width:100%;
 max-width: 150px;
  height: 60px;

  border-radius: 20px;

}
.knop{
  
 text-align: center;
    justify-content: center;
  align-items: center;
  background-color: rgb(32, 135, 214);
  color: white;
  
display: none;


}
.knop:hover{
   background-color: rgb(49, 166, 255);
}
#timerKnop{
  display: flex ;


}
#StopKnop{
  
  max-width: 100px;
  background-color: red ;
}
#StopKnop:hover{
  background-color: rgb(178, 28, 28) ;
}



#balk{
  margin-top: 30px;
  width: 100%;
  height: 20px;
  border: 5px solid black;
  border-radius: 10px;
visibility: hidden;
}
#voortgang{
  transition: 0.5s;
  background-color: chartreuse;
  height: 100%;
  width: 100%;
  display: none;

}

.knipper{
  animation: knipperen infinite 0.5s;
}

@keyframes knipperen{
  0%{
    color: white;
  }
  50%{
    color: transparent;
  }
   100%{
    color: white;
  }
}