platform_largeScreen/src/assets/styles/blueStyle/el-override/el-card.less

.main-body {
  .el-card {
    background: transparent;
    border-color: fade(@gray, 50);
    border-radius: 0;

    .el-card__header {
      color: @gray-l;
      background: fade(@gray, 20);
      border: none;
    }
  }
}