retina-dom-to-image/spec/resources/hash/style.css

A fork of the dom-to-image library that outputs an image for higher DPI screens

#dom-node {
    width: 100px;
}

.red {
    background-color: #ff0000;
}

.green {
    background-color: green;
}

.blue {
    background-color: #0000ff;
}

.red,
.green,
.blue {
    height: 3px;
    border: 1px solid lightgrey;
}