// 部分透明遮罩
.part-transparent-mask(left, @color) {
    background-color: @color;
    -webkit-mask-image: -webkit-linear-gradient(left, transparent 0, #000 100%);
}

.part-transparent-mask(right, @color) {
    background-color: @color;
    -webkit-mask-image: -webkit-linear-gradient(right, transparent 0, #000 100%);
}

.part-transparent-mask(top, @color) {
    background-color: @color;
    -webkit-mask-image: -webkit-linear-gradient(top, transparent 0, #000 100%);
}

.part-transparent-mask(bottom, @color) {
    background-color: @color;
    -webkit-mask-image: -webkit-linear-gradient(bottom, transparent 0, #000 100%);
}