linear-gradient@mixin gradient($base_color, $color1, $color2, $color3) { background-color: $base_color; background-image: linear-gradient(top, $base_color, $color1 50%, $color2 51%, $color3); background-image: -o-linear-gradient(top, $base_color, $color1 50%, $color2 51%, $color3); background-image: -ms-linear-gradient(top, $base_color, $color1 50%, $color2 51%, $color3); background-image: -webk..