.main-container .main-content1 .move .list-one>li.on:after{ ????content: ''; ????position: absolute; ????left: 0; ????right: 0; ????margin: auto; ????width: 0; ????height: 100%; ????background-color: rgba(0,0,0,.5); ????transition: .5s;}}.main-container .main-content1 .move .list-one>li.on:hover:after{ ????width: 100%;}我不希望鼠標移動到li的子元素也出現效果，該怎么弄