SASS iteration, interpolation, mixin, function

gistfile1.scss

$sections: section1, section2;
$section1-bg: #72B075;
$section2-bg: #D4968E;

@mixin border-radius($amount) {
  -webkit-border-radius: $amount;
  -moz-border-radius   : $amount;
  -o-border-radius     : $amount;
  -ms-border-radius    : $amount;
  border-radius        : $amount;
}

@function get_background($arg) {
  @if $arg == section1 { @return $section1-bg }
  @if $arg == section2 { @return $section2-bg }
}

@each $section in $sections {
  .#{$section} {
    @include border-radius(8px);
    background: get_background($section);
    padding: 20px 0px 20px 20px; }
}