修正avid theme 手機瀏覽時的slider大小

theme options -> custom CSS

@media only screen and (max-width: 640px) {
#sliders-container .fusion-slider-container,
#sliders-container .fusion-slider-container .tfs-slider,
#sliders-container .fusion-slider-container .tfs-slider .background {
    height: 250px !important;
}
}
}

調整高度為250px