@charset "UTF-8";

.index__list ul li:nth-child(1) a span { background-image: url(img_thumb_01.jpg); }
.index__list ul li:nth-child(2) a span { background-image: url(img_thumb_02.jpg); }
.index__list ul li:nth-child(3) a span { background-image: url(img_thumb_03.jpg); }