body {
  background:#000;
  color:f9f9f9;
  padding:10px;
}

#algorithm {
  label {
    width:250px;
    display:inline-block;
  }
}

.hidden {
  display:none !important;
}

.running:before {
  display:inline-block;
  content: ' ';
  border-radius: 50%;
  border: .5rem solid rgba(0,0,0,0.25);
  border-top-color: #fff;
  animation: spin 1s infinite linear;
  width:16px;
  height:16px;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

#drop-area {
  border: 2px dashed #ccc;
  border-radius: 20px;
  max-width:480px;
  width: 50%;
  font-family: sans-serif;
  margin: 10px 0;
  padding: 20px;
  &.highlight {
    border-color: purple;
  }
}

.button {
  display: inline-block;
  padding: 10px;
  color:#000;
  background: #ccc;
  cursor: pointer;
  border-radius: 5px;
  border: 1px solid #ccc;
  &:hover {
    background: #ddd;
  }
}

#fileElem {
  display: none;
}