Ph Scale Gradient
background: #990000;
background: linear-gradient(90deg, rgba(153, 0, 0, 1) 1%, rgba(204, 0, 0, 1) 7%, rgba(230, 0, 0, 1) 14%, rgba(255, 102, 0, 1) 21%, rgba(255, 153, 0, 1) 28%, rgba(255, 204, 0, 1) 35%, rgba(255, 255, 0, 1) 42%, rgba(102, 204, 0, 1) 49%, rgba(0, 153, 0, 1) 56%, rgba(0, 153, 255, 1) 63%, rgba(0, 102, 255, 1) 70%, rgba(0, 51, 204, 1) 77%, rgba(51, 0, 204, 1) 84%, rgba(102, 0, 204, 1) 91%, rgba(102, 0, 153, 1) 98%);
