i {display: inline-flex; align-items: center; justify-content: center; background-repeat: no-repeat; background-size: contain; background-position: center; vertical-align: middle;}

/* icon(a b c d e f g h i j k l m n o p q r s t u v w x y z) */
.ic-arrow-up-16 {width: 1.6rem; height: 1.6rem; background-image: url(../img/icon/ic-arrow-up-16.svg);}
.ic-arrow-down-16 {width: 1.6rem; height: 1.6rem; background-image: url(../img/icon/ic-arrow-down-16.svg);}
.ic-arrow-down-16-pink {width: 1.6rem; height: 1.6rem; background-image: url(../img/icon/ic-arrow-down-16-pink.svg);}
.ic-arrow-right-12-gray {width: 1.2rem; height: 1.2rem; background-image: url(../img/icon/ic-arrow-right-12-gray.svg);}