📅  最后修改于: 2022-03-11 14:47:59.389000             🧑  作者: Mango
/* Prevent Child Margin from Moving Parent */
.parent {
margin: -1px;
padding: 1px;
}
/* Alternatively */
.parent {
display: flow-root; /* no supported by IE 11 */
}
/*
Learn more: https://www.w3.org/TR/CSS2/box.html#collapsing-margins
*/