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

#ce-gradient2 {
    height: 300px;
    background-image: linear-gradient(to right, #646e80, #80647c);
}
                                    

#ce-gradient3 {
    height: 300px;
    background-image: linear-gradient(to bottom right, #646e80, #80647c);
}
                                    

#ce-gradient4 {
    height: 300px;
    background-image: linear-gradient(#646e80, #80647c);
}
                                    

#ce-gradient5 {
    height: 300px;
    background-image: linear-gradient(to right, #646e80, #80647c); 
}
                                    

#ce-gradient6 {
    height: 300px;
    background-image: repeating-linear-gradient(#646e80 10%, #80647c 20%); 
}
                                    

#ce-gradient7 {
    height: 300px;
    background-image: radial-gradient( #646e80, #80647c);
}
                                    

#ce-gradient8 {
    height: 300px;
    background-image: radial-gradient( #646e80 30%, #80647c 60%);
}
                                    

#ce-gradient9 {
    height: 300px;
    background-image: radial-gradient(circle, #646e80, #80647c);
}
                                    

#ce-gradient10 {
    height: 300px;
    background-image: radial-gradient(closest-side at 60% 55%, #646e80, #80647c);
}
                                    

#ce-gradient11 {
    height: 300px;
    background-image: radial-gradient(farthest-side at 60% 55%, #646e80, #80647c);
}
                                    

#ce-gradient12 {
    height: 300px;
    background-image: repeating-radial-gradient(#646e80 10%, #80647c 15%);
}
                                    

#stacked-linear {
    height: 300px;
    background:
        linear-gradient(217deg, rgba(100,110,128,0.8), rgba(0,0,0,0) 70.71%),
        linear-gradient(127deg, rgba(128,100,124,0.8), rgba(0,0,0,0) 70.71%),
        linear-gradient(336deg, rgba(128,118,100,0.8), rgba(0,0,0,0) 70.71%);
}
                                    

#stacked-radial {
    height: 300px;
    background:
        radial-gradient(circle at 50% 0,rgba(100,110,128,0.5),rgba(0,0,0,0) 70.71%),
        radial-gradient(circle at 6.7% 75%,rgba(128,100,124,0.5),rgba(0,0,0,0) 70.71%),
        radial-gradient(circle at 93.3% 75%,rgba(128,118,100,0.5),rgba(0,0,0,0) 70.71%);
}