body{
    text-align: center;
}

.arrow-keys{
  width: 20px;
}
.imginvert{
  filter: invert(1);

}
.valls{
  font-size: 29px!important;
}
.active{
  background-color: #000000!important;
  
}

.active .arrow-keys{
  filter: invert(1);
}
.gamebox{
    /* width */
    margin-top: 100px;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
}
.game{
  width: 100%!important;
}

.game>.card-body{
  width: 100%;

}

.tiles {
float: left;
width: 25%;
text-align: center;
border-right: 3px #000000 solid;
border-bottom: 3px #000000 solid;
border-left: 3px #CCCCCC solid;
border-top: 3px #CCCCCC solid;
font-family: Arial;
font-weight: bold;
padding-top: 12px;
}

.emptySpace {
float: left;
width: 25%;
}


.slidecontainer {
    width: 100%;
  }
  
  .slider {
    -webkit-appearance: none;
    width: 100%;
    height: 25px;
    background: #d3d3d3;
    outline: none;
    opacity: 0.7;
    -webkit-transition: .2s;
    transition: opacity .2s;
  }
  
  .slider:hover {
    opacity: 1;
  }
  
  .slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 25px;
    height: 25px;
    background: #17c1e8;
    cursor: pointer;
  }
  
  .slider::-moz-range-thumb {
    width: 25px;
    height: 25px;
    background: #17c1e8;
    cursor: pointer;
  }