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.arrow-img.is-7{-webkit-filter:drop-shadow(2px 2px 2px #777);filter:drop-shadow(2px 2px 2px #777)}a.to-top-button .arrow-img.is-8{-webkit-filter:drop-shadow(2px 2px 2px #888);filter:drop-shadow(2px 2px 2px #888)}a.to-top-button .arrow-img.is-9{-webkit-filter:drop-shadow(2px 2px 2px #999);filter:drop-shadow(2px 2px 2px #999)}a.to-top-button .arrow-img.is-10{-webkit-filter:drop-shadow(2px 2px 2px #AAA);filter:drop-shadow(2px 2px 2px #AAA)}a.to-top-button .arrow-img.is-11{-webkit-filter:drop-shadow(2px 2px 2px #BBB);filter:drop-shadow(2px 2px 2px #BBB)}a.to-top-button .arrow-img.is-12{-webkit-filter:drop-shadow(2px 2px 2px #CCC);filter:drop-shadow(2px 2px 2px #CCC)}a.to-top-button .arrow-img.is-13{-webkit-filter:drop-shadow(2px 2px 2px #DDD);filter:drop-shadow(2px 2px 2px #DDD)}a.to-top-button .arrow-img.is-14{-webkit-filter:drop-shadow(2px 2px 2px #EEE);filter:drop-shadow(2px 2px 2px #EEE)}a.to-top-button .arrow-img.is-15{-webkit-filter:drop-shadow(2px 2px 2px #FFF);filter:drop-shadow(2px 2px 2px #FFF)}