Clearfix SASS Mixin

// http://nicolasgallagher.com/micro-clearfix-hack/
@mixin clearfix {
// For modern browsers
&:before,
&:after {
content
:" ";
display
:table;
}

&:after {
clear
:both;
}

// For IE 6/7 (trigger hasLayout)
& {
*zoom:1;
}
}