border多层渐变

   .content {
          margin-top: 19px;
          border-top: 1px dashed rgba(113, 183, 248, 0.6) !important;
          border-left: 1px dashed;
          border-right: 1px dashed;
          border-image: linear-gradient(
              180deg,
              rgba(113, 183, 248, 0.6) 20%,
              rgba(255, 255, 255, 0) 30%
            )
            2 2 2 2;
          background: linear-gradient(
            0deg,
            rgba(3, 18, 36, 1) 45%,
            rgba(2, 42, 81, 1)
          );
}