Violet ,Yellow,Green & Blue Color Gradients - Gradient backgrounds with CSS & PNG

#ce-gradient2 {
    height: 300px;
    background-image: linear-gradient(to right, #31222b, #312f22);
}
                                    

#ce-gradient3 {
    height: 300px;
    background-image: linear-gradient(to bottom right, #31222b, #312f22);
}
                                    

#ce-gradient4 {
    height: 300px;
    background-image: linear-gradient(#31222b, #312f22);
}
                                    

#ce-gradient5 {
    height: 300px;
    background-image: linear-gradient(to right, #31222b, #312f22); 
}
                                    

#ce-gradient6 {
    height: 300px;
    background-image: repeating-linear-gradient(#31222b 10%, #312f22 20%); 
}
                                    

#ce-gradient7 {
    height: 300px;
    background-image: radial-gradient( #31222b, #312f22);
}
                                    

#ce-gradient8 {
    height: 300px;
    background-image: radial-gradient( #31222b 30%, #312f22 60%);
}
                                    

#ce-gradient9 {
    height: 300px;
    background-image: radial-gradient(circle, #31222b, #312f22);
}
                                    

#ce-gradient10 {
    height: 300px;
    background-image: radial-gradient(closest-side at 60% 55%, #31222b, #312f22);
}
                                    

#ce-gradient11 {
    height: 300px;
    background-image: radial-gradient(farthest-side at 60% 55%, #31222b, #312f22);
}
                                    

#ce-gradient12 {
    height: 300px;
    background-image: repeating-radial-gradient(#31222b 10%, #312f22 15%);
}
                                    

#stacked-linear {
    height: 300px;
    background:
        linear-gradient(217deg, rgba(49,34,43,0.8), rgba(0,0,0,0) 70.71%),
        linear-gradient(127deg, rgba(49,47,34,0.8), rgba(0,0,0,0) 70.71%),
        linear-gradient(336deg, rgba(34,49,40,0.8), rgba(0,0,0,0) 70.71%);
}
                                    

#stacked-radial {
    height: 300px;
    background:
        radial-gradient(circle at 50% 0,rgba(49,34,43,0.5),rgba(0,0,0,0) 70.71%),
        radial-gradient(circle at 6.7% 75%,rgba(49,47,34,0.5),rgba(0,0,0,0) 70.71%),
        radial-gradient(circle at 93.3% 75%,rgba(34,49,40,0.5),rgba(0,0,0,0) 70.71%);
}