Margin Spacing Properties
margin
margin: <#width#>;
margin: <#top/bottom#> <#right/left#>;
margin: <#top#> <#right/left#> <#bottom#>;
margin: <#top#> <#right#> <#bottom#> <#left#>;
margin-top: <#width#>;
margin-right: <#width#>;
margin-bottom: <#width#>;
margin-left: <#width#>;
opacity