*{ margin: 0; padding: 0; } .header{ width: 100%; height: 110px; position: fixed; top: 0; left: 0; z-index: 999; } .content{ width: 100%; position: relative; /*top: 110px;*/ } .conBox{ width: 1200px; margin: 0 auto; } .dropMap{ position: absolute; top: 100%; background-color: #fff; box-shadow: 1px 0 4px #c2bfbf; } .drop-default{ width: 560px; height: 340px; display: flex; }