
const commonDeclarations = {
  boxSizing: [
    'border-box'
  ],

  display: [
    'block',
    'inline-block',
    'inline',
    'table',
    'table-cell',
    'none'
  ],

  float: [
    'none',
    'left',
    'right'
  ],
  clear: [
    'none',
    'left',
    'right',
    'both'
  ],

  textAlign: [
    'left',
    'center',
    'right',
    'justify'
  ],

  fontWeight: [
    'bold',
    'normal'
  ],

  textDecoration: [
    'none',
    'underline'
  ],
  whiteSpace: [ 'nowrap' ],
  listStyle: [ 'none' ],
  overflow: [
    'hidden',
    'scroll'
  ],

  margin: [ 0 ],
  marginTop: [ 0 ],
  marginRight: [ 0 ],
  marginBottom: [ 0 ],
  marginLeft: [ 0 ],
  padding: [ 0 ],
  paddingTop: [ 0 ],
  paddingRight: [ 0 ],
  paddingBottom: [ 0 ],
  paddingLeft: [ 0 ],

  maxWidth: [ '100%' ],
  height: [ 'auto' ],

  verticalAlign: [
    'top',
    'middle',
    'bottom',
    'baseline'
  ],

  position: [
    'relative',
    'absolute',
    'fixed'
  ],

  borderRadius: [ 0 ],
  
  backgroundSize: [
    'contain',
    'cover'
  ],
  backgroundRepeat: [
    'no-repeat',
    'repeat',
    'repeat-x',
    'repeat-y'
  ],
  backgroundPosition: [
    'top',
    'right',
    'bottom',
    'left',
    'center'
  ]
}

export default commonDeclarations


const commonDeclarations = {
  boxSizing: [
    'border-box'
  ],

  display: [
    'block',
    'inline-block',
    'inline',
    'table',
    'table-cell',
    'none'
  ],

  float: [
    'none',
    'left',
    'right'
  ],
  clear: [
    'none',
    'left',
    'right',
    'both'
  ],

  textAlign: [
    'left',
    'center',
    'right',
    'justify'
  ],

  fontWeight: [
    'bold',
    'normal'
  ],

  textDecoration: [
    'none',
    'underline'
  ],
  whiteSpace: [ 'nowrap' ],
  listStyle: [ 'none' ],
  overflow: [
    'hidden',
    'scroll'
  ],

  margin: [ 0 ],
  marginTop: [ 0 ],
  marginRight: [ 0 ],
  marginBottom: [ 0 ],
  marginLeft: [ 0 ],
  padding: [ 0 ],
  paddingTop: [ 0 ],
  paddingRight: [ 0 ],
  paddingBottom: [ 0 ],
  paddingLeft: [ 0 ],

  maxWidth: [ '100%' ],
  height: [ 'auto' ],

  verticalAlign: [
    'top',
    'middle',
    'bottom',
    'baseline'
  ],

  position: [
    'relative',
    'absolute',
    'fixed'
  ],

  borderRadius: [ 0 ]
}

export default commonDeclarations


--- 
+++ 
@@ -75,25 +75,8 @@
     'fixed'
   ],
 
-  borderRadius: [ 0 ],
-  
-  backgroundSize: [
-    'contain',
-    'cover'
-  ],
-  backgroundRepeat: [
-    'no-repeat',
-    'repeat',
-    'repeat-x',
-    'repeat-y'
-  ],
-  backgroundPosition: [
-    'top',
-    'right',
-    'bottom',
-    'left',
-    'center'
-  ]
+  borderRadius: [ 0 ]
 }
 
 export default commonDeclarations
+
Add backgrounds to common declarations

backgroundSize, backgroundRepeat, & backgroundPosition