blur-admin/src/app/pages/dashboard/widgets/todo/_todo.scss

input.task-todo {
  margin-bottom: 14px;
}

ul.todo-list {
  margin: 0;
  padding: 0;
  .placeholder, .ui-sortable-placeholder {
    background: #fff;
  }
  li {
    margin: 0 0 -1px 0;
    padding: 12px;
    list-style: none;
    position: relative;
    border: 1px solid $input-border;
    cursor: grab;
    height: 42px;
    &.ui-sortable-helper {
      background: #ffffff;
    }
    i.remove-todo {
      position: absolute;
      cursor: pointer;
      top: 0px;
      right: 12px;
      font-size: 32px;
      transition: color 0.2s;
      color: $input-border;
      visibility: hidden;
      line-height: 42px;
      &:hover {
        color: $danger-dark;
      }
    }
    &:hover {
      i.remove-todo {
        visibility: visible;
      }
    }

    &.checked {
      .todo-text {
        color: #BFBFBF;
      }
      &:before {
        background: $input-border !important;
      }
    }

    @mixin mark($color) {
      i.mark {
        background: $color;
      }
    }
    &.primary {
      @include mark($primary);
    }
    &.danger {
      @include mark($danger);
    }
    &.success {
      @include mark($success);
    }
    &.info {
      @include mark($info);
    }
    &.warning {
      @include mark($warning);
    }

    i.mark {
      display: block;
      position: absolute;
      top: -1px;
      left: -1px;
      height: 42px;
      min-width: 4px;
      background: $input-border;
      cursor: pointer;
      transition: min-width 0.3s ease-out;
    }

    &.active {
      i.mark {
        min-width: 40px;
      }
      label.todo-checkbox>span {
        &:before {
          color: white;
          content: '\f10c';
          margin-right: 20px;
          transition: margin-right 0.1s ease-out;
          transition-delay: 0.2s;
        }
      }
      label.todo-checkbox>input:checked+span:before {
        content: '\f00c';
      }
    }
  }
}

label.todo-checkbox {
  width: 100%;
  padding-right: 25px;
  min-height: 16px;
  cursor: pointer;
  >span {
    white-space: nowrap;
    height: 16px;
    &:before {
      border: none;
      color: $help-text;
      transition: all 0.15s ease-out;
    }
  }
}