Rather than repeating the .xblock phrase with this class, why not apply an additional class to this element and provide a nested case in your sass for these different levels (see below)?

```html
<section class="wrapper-xblock level-element type-container"></section>
```

```scss
.wrapper-xblock {

  // USE: container - base container styles
  &.type-container {
    
  }
  
  // CASE: element-level xblock rendering
  &.level-element {

    // USE: container - specific element-level container styles
    &.type-container {

    }
  }
}
```