button.btn {
    padding: 4px;
    border-radius: 2px;
}

button.btn.full {
    width: 100%;
}

button.btn.content {
    width: fit-content;
}

.space-top {
    margin-top: 2px;
}

.error {
     color: red;
 }

#canvas, #square {
    max-height: 600px;
    border-radius: 2px;
}

#canvas, #square, .error {
    width: 100%;
    display: none;
}

#canvas.visible, .error.visible, #square.visible {
    display: block;
}

#or {
    border-top:  1px dashed #ccc;
    border-bottom:  1px dashed #ccc;
    padding: 15px 0;
    margin: 30px 0;
}