#header {
    font-family: 'Orbitron', sans-serif;
}

#instruction {
    min-height: 30vh !important;
}

#canvas{
  border: solid 1px black;  
}

#button{
    margin: 0 auto;
}

.row {
    height: 100%;
}


output {
    margin-left: 20px;
}

.slider {
    -webkit-appearance: none;
    width: 100%;
    height: 15px;
    border-radius: 5px;   
    background: #d3d3d3;
    outline: none;
    opacity: 0.7;
    -webkit-transition: .2s;
    transition: opacity .2s;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 25px;
    height: 25px;
    border-radius: 50%; 
    background: #4CAF50;
    cursor: pointer;
}

.slider::-moz-range-thumb {
    width: 25px;
    height: 25px;
    border-radius: 50%;
    background: #4CAF50;
    cursor: pointer;
}

.label {
    min-width: 80px !important;
    display: inline-block !important 
}