background: linear-gradient(to left, #50dde6, #50dde6) left top no-repeat,
              linear-gradient(to bottom, #50dde6, #50dde6) left top no-repeat,
              linear-gradient(to left, #50dde6, #50dde6) right top no-repeat,
              linear-gradient(to bottom, #50dde6, #50dde6) right top no-repeat,
              linear-gradient(to left, #50dde6, #50dde6) left bottom no-repeat,
              linear-gradient(to bottom, #50dde6, #50dde6) left bottom no-repeat,
              linear-gradient(to left, #50dde6, #50dde6) right bottom no-repeat,
              linear-gradient(to left, #50dde6, #50dde6) right bottom no-repeat;
  background-size: 3px 20px, 30px 3px, 3px 20px, 30px 3px;
  box-shadow:0 0 10px #fff inset;