Red ,Green,Blue & Brown Color Gradients - Gradient backgrounds with CSS & PNG

#ce-gradient2 {
    height: 300px;
    background-image: linear-gradient(to right, #45212b, #21453b);
}
                                    

#ce-gradient3 {
    height: 300px;
    background-image: linear-gradient(to bottom right, #45212b, #21453b);
}
                                    

#ce-gradient4 {
    height: 300px;
    background-image: linear-gradient(#45212b, #21453b);
}
                                    

#ce-gradient5 {
    height: 300px;
    background-image: linear-gradient(to right, #45212b, #21453b); 
}
                                    

#ce-gradient6 {
    height: 300px;
    background-image: repeating-linear-gradient(#45212b 10%, #21453b 20%); 
}
                                    

#ce-gradient7 {
    height: 300px;
    background-image: radial-gradient( #45212b, #21453b);
}
                                    

#ce-gradient8 {
    height: 300px;
    background-image: radial-gradient( #45212b 30%, #21453b 60%);
}
                                    

#ce-gradient9 {
    height: 300px;
    background-image: radial-gradient(circle, #45212b, #21453b);
}
                                    

#ce-gradient10 {
    height: 300px;
    background-image: radial-gradient(closest-side at 60% 55%, #45212b, #21453b);
}
                                    

#ce-gradient11 {
    height: 300px;
    background-image: radial-gradient(farthest-side at 60% 55%, #45212b, #21453b);
}
                                    

#ce-gradient12 {
    height: 300px;
    background-image: repeating-radial-gradient(#45212b 10%, #21453b 15%);
}
                                    

#stacked-linear {
    height: 300px;
    background:
        linear-gradient(217deg, rgba(69,33,43,0.8), rgba(0,0,0,0) 70.71%),
        linear-gradient(127deg, rgba(33,69,59,0.8), rgba(0,0,0,0) 70.71%),
        linear-gradient(336deg, rgba(33,61,69,0.8), rgba(0,0,0,0) 70.71%);
}
                                    

#stacked-radial {
    height: 300px;
    background:
        radial-gradient(circle at 50% 0,rgba(69,33,43,0.5),rgba(0,0,0,0) 70.71%),
        radial-gradient(circle at 6.7% 75%,rgba(33,69,59,0.5),rgba(0,0,0,0) 70.71%),
        radial-gradient(circle at 93.3% 75%,rgba(33,61,69,0.5),rgba(0,0,0,0) 70.71%);
}