body{
  font-family: Arial, Helvetica, sans-serif;
}

details{
  margin:3px;
  padding: 3px;
}

canvas{
  border: 1px solid black;

}

h1{
  font-size: 16px;
  font-family: Arial, Helvetica, sans-serif;
}

label{
  font-size: 16px;
}

input[type = "text"], input[type = "number"]{
  width: 5em;
}

details{
  border: 1px solid black;
}

@keyframes flash {
  0%, 100% {
   color: black;
    
  }
  50% {
    color: white;
  }
}

.flash {
  animation: flash 0.2s 10;
  
}