Single value lengths (freeCodeCamp#19399)

Added note for auto value if only one length parameter is specified.
jger · Oct 16, 2018 · 0e4345f · 0e4345f
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diff --git a/client/src/pages/guide/english/css/background-size/index.md b/client/src/pages/guide/english/css/background-size/index.md
@@ -16,6 +16,8 @@ The background-size property specifies the size of the background images. You ca
 .percentage {background-size: 50% 50%;}
 .view {background-size: 50vw 50vh;}
 ```
+Note: If using pixel or percentage for length and you only specify one value, 
+the second one will be set to auto by default.
 
 To set this property on multiple background images separate values by comma:
 ```css