@mixin linearGradient($top, $bottom){
    background: $top; /* Old browsers */
    background: -moz-linear-gradient(top,  $top 0%, $bottom 100%); /* FF3.6+ */
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,$top), color-stop(100%,$bottom)); /* Chrome,Safari4+ */
    background: -webkit-linear-gradient(top,  $top 0%,$bottom 100%); /* Chrome10+,Safari5.1+ */
    background: -o-linear-gradient(top,  $top 0%,$bottom 100%); /* Opera 11.10+ */
    background: -ms-linear-gradient(top,  $top 0%,$bottom 100%); /* IE10+ */
    background: linear-gradient(to bottom,  $top 0%,$bottom 100%); /* W3C */
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='#000000',GradientType=0 ); /* IE6-9 */
}

// pattern mixin
@mixin pattern($bg-primary,$bg-secondary) {
  background:
    repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 1em,
    rgba($bg-secondary,0.4) 0,
    rgba($bg-secondary,0.1) 2em,
    transparent 0,
    transparent 1em,
    rgba($bg-secondary,0.3) 0,
    rgba($bg-secondary,0.2) 4em,
    transparent 0,
    transparent 1em,
    rgba($bg-primary,0.6) 0,
    rgba($bg-primary,0.2) 2em
  ),
  repeating-linear-gradient(
    45deg,
    transparent,
    transparent 1em,
    rgba($bg-secondary,0.4) 0,
    rgba($bg-secondary,0.1) 2em,
    transparent 0,
    transparent 1em,
    rgba($bg-secondary,0.3) 0,
    rgba($bg-secondary,0.2) 4em,
    transparent 0,
    transparent 1em,
    rgba($bg-primary,0.4) 0,
    rgba($bg-primary,0.1) 2em
  ), #FFF;
  // background-blend-mode: multiply;
  // background-attachment: fixed;
}