CSS心形背景：

1. background: 
2. radial-gradient(circle at 60% 65%, red 64%,#0000 65%) top left/50% 50%,
3. radial-gradient(circle at 40% 65%, red 64%,#0000 65%) top right/50% 50%,
4. conic-gradient(from -45deg at 50% 85.5%, red 90deg,#0000 0) bottom/100% 50%;
5. background-repeat: no-repeat;