testbed/Textualize__textual/docs/examples/styles/background.css

Static {
    height: 1fr;
    content-align: center middle;
    color: white;
}    
#static1 {
    background: red;
}
#static2 {
    background: rgb(0, 255, 0);
}
#static3 {
    background: hsl(240, 100%, 50%);
}