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第一行是將OPACITY改成0, 第2行是HOVER時的透明度 (0~1, 小數)
.cmp_arrow_right.pif-arrow-right, .cmp_back_to_today.pif-arrow-left { opacity: 0; }
.browse_button:hover .cmp_arrow_right.pif-arrow-right, .browse_button:hover .cmp_back_to_today.pif-arrow-left, .cmp_arrow_left.pif-arrow-left { opacity: .4; }