css 四角边框

    background: linear-gradient(
                to left,
                rgb(4, 172, 247),
                rgb(4, 172, 247)
              )
              left top no-repeat,
            linear-gradient(to bottom, rgb(4, 172, 247), rgb(4, 172, 247)) left
              top no-repeat,
            linear-gradient(to left, rgb(4, 172, 247), rgb(4, 172, 247)) right
              top no-repeat,
            linear-gradient(to bottom, rgb(4, 172, 247), rgb(4, 172, 247)) right
              top no-repeat,
            linear-gradient(to left, rgb(4, 172, 247), rgb(4, 172, 247)) left
              bottom no-repeat,
            linear-gradient(to bottom, rgb(4, 172, 247), rgb(4, 172, 247)) left
              bottom no-repeat,
            linear-gradient(to left, rgb(4, 172, 247), rgb(4, 172, 247)) right
              bottom no-repeat,
            linear-gradient(to left, rgb(4, 172, 247), rgb(4, 172, 247)) right
              bottom no-repeat;
          /*设置大小*/
          background-size: 0.0125rem 0.4rem, 0.4rem 0.0125rem, 0.0125rem 0.4rem,
            0.4rem 0.0125rem;

// background-size: 2px 80px, 80px 2px, 2px 80px, 80px 2px,2px 80px, 80px 2px, 2px 80px, 80px 2px;
// background-size: 0.0125rem 0.4rem, 0.4rem 0.0125rem, 0.0125rem 0.4rem,
0.4rem 0.0125rem;

image.png image.png

background: linear-gradient(
            to left,
            rgb(4, 172, 247),
            rgb(4, 172, 247)
          )
          left top no-repeat,
        linear-gradient(to bottom, rgb(4, 172, 247), rgb(4, 172, 247)) left
          top no-repeat,
        linear-gradient(to left, rgb(4, 172, 247), rgb(4, 172, 247)) right
          top no-repeat,
        linear-gradient(to bottom, rgb(4, 172, 247), rgb(4, 172, 247)) right
          top no-repeat,
        linear-gradient(to left, rgb(4, 172, 247), rgb(4, 172, 247)) left
          bottom no-repeat,
        linear-gradient(to bottom, rgb(4, 172, 247), rgb(4, 172, 247)) left
          bottom no-repeat,
        linear-gradient(to left, rgb(4, 172, 247), rgb(4, 172, 247)) right
          bottom no-repeat,
        linear-gradient(to left, rgb(4, 172, 247), rgb(4, 172, 247)) right
          bottom no-repeat;
      /*设置大小*/
      background-size: 0.0125rem 0.4rem, 0.4rem 0.0125rem, 0.0125rem 0.4rem,
        0.4rem 0.0125rem;