.index{font-size:1.666rem;}.index__link{display:block;margin:0.625em 0;background-image:linear-gradient(transparent calc(100% - 3px),currentColor 3px);background-repeat:no-repeat;background-size:0 100%;width:fit-content;transition:background-size 0.25s,margin-left 0.25s;&:hover{background-size:100% 100%;margin-left:10px;}}.index__list{padding:0;}.index__item{display:block;}