er-top-left-radius($radius);
  @include border-bottom-left-radius($radius);
}

@mixin background-size($size){
  -webkit-background-size: $size;
  -moz-background-size: $size;
  -o-background-size: $size;
  background-size: $size;
}

@mixin box-sizing($boxsize) {
  -webkit-box-sizing: $boxsize;
  -moz-box-sizing: $boxsize;
  -ms-box-sizing: $boxsize;
  -o-box-sizing: $boxsize;
  -khtml-box-sizing: $boxsize;
  box-sizing: $boxsize;
}

@mixin horizontal-gradient($startColour, $endColour) {
  background-color: 