body {
    font-family: sans-serif;
}
footer {
    font-size: 80%;
    color: darkgray;
}
label {
    text-align: right;
}
.custom-file label {
    text-align: left;
}
#diagram td {
    width: 35px;
    height: 35px;
    background: white;
    border: 1px solid black;
}
#diagram td .number {
    font: normal 70% sans-serif;
    vertical-align: top;
    position: relative;
    top: -7px;
}
canvas {
    border: 1px solid black;
}
.btn {
    font-weight: bold;
}
h1, h2, h3 {
    font-family: sans-serif;
    font-weight: 700;
    font-stretch: 75;
    margin-top: 0.5em;
}
span.nodesc {
    color: red;
}