背景图片上面一层渐变色怎么覆盖上去的，求大神指教！！HTML5,CSS3

背景图上加个div层

然后参考下这个吧
.toLeft {
background-image:-webkit-linear-gradient(
to left,
rgba(255,0,0,0) 0%,
rgba(255,0,0,0.8) 7%,
rgba(255,0,0,1) 11%,
rgba(255,0,0,1) 12%,
rgba(255,252,0,1) 28%,
rgba(1,180,7,1) 45%,
rgba(0,234,255,1) 60%,
rgba(0,3,144,1) 75%,
rgba(255,0,198,1) 88%,
rgba(255,0,198,0.8) 93%,
rgba(255,0,198,0) 100%);
background-image:linear-gradient(
to left,
rgba(255,0,0,0) 0%,
rgba(255,0,0,0.8) 7%,
rgba(255,0,0,1) 11%,
rgba(255,0,0,1) 12%,
rgba(255,252,0,1) 28%,
rgba(1,180,7,1) 45%,
rgba(0,234,255,1) 60%,
rgba(0,3,144,1) 75%,
rgba(255,0,198,1) 88%,
rgba(255,0,198,0.8) 93%,
rgba(255,0,198,0) 100%);
}
.toRight {
background-image:-webkit-linear-gradient(
to right,
rgba(255,0,0,0) 0%,
rgba(255,0,0,0.8) 7%,
rgba(255,0,0,1) 11%,
rgba(255,0,0,1) 12%,
rgba(255,252,0,1) 28%,
rgba(1,180,7,1) 45%,
rgba(0,234,255,1) 60%,
rgba(0,3,144,1) 75%,
rgba(255,0,198,1) 88%,
rgba(255,0,198,0.8) 93%,
rgba(255,0,198,0) 100%);
background-image: linear-gradient(
to right,
rgba(255,0,0,0) 0%,
rgba(255,0,0,0.8) 7%,
rgba(255,0,0,1) 11%,
rgba(255,0,0,1) 12%,
rgba(255,252,0,1) 28%,
rgba(1,180,7,1) 45%,
rgba(0,234,255,1) 60%,
rgba(0,3,144,1) 75%,
rgba(255,0,198,1) 88%,
rgba(255,0,198,0.8) 93%,
rgba(255,0,198,0) 100%);
}

svg不用客气啊啊啊啊啊

对于这种比较麻烦而且自己没哪个技术的情况，直接使用带走渐变的图片不行？