vikunja-frontend/src/styles/theme/background.scss

.app-container.has-background {
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  background-attachment: fixed;
  min-height: 100vh;

  .namespace-container {
    background: $transparent-background-light;
  }

  .tasks {
    background: $transparent-background-light;
    border-radius: $radius;

    .task:first-child {
      border-radius: $radius $radius 0 0;
    }

    .task:last-child {
      border-radius: 0 0 $radius $radius;
    }
  }

  .table-view .table {
    background: $transparent-background-light;
    border-radius: $radius;
  }

  .pagination-link:not(.is-current) {
    background: $light-background;
  }

  .box,
  .card,
  .switch-view,
  .table-view .button,
  .search .button {
    box-shadow: none;
  }

  .task-view {
    border-radius: $radius;
    margin-top: 1em;
  }
}

.navbar.has-background {
  background: $transparent-background-light;
}