<div class="login-modal"> <div clas="login-overlay">灰色背景</div> <div class="login-modal-main">登录界面弹框</div></div>.login-modal{ /*display: none;*/ z-index: 100; overflow: hidden; position: fixed; top: 0; bottom: 0; left:0; width: 100%; height: 100%;}.login-overlay{ background-color: #000; opacity: 0.25; width: 100%; height: 100%;}.login-modal-main{ width: 370px; margin: 0 auto; position: absolute; background-color: #fff; border-radius: 5px; transform:translate(-50%,-50%); -webkit-transform:translate(-50%,-50%); -moz-transform:translate(-50%,-50%); -ms-transform:translate(-50%,-50%); -o-transform:translate(-50%,-50%); left: 50%; top: 35%;}弹出登录,界面滚动下去时,会抖动一下,感觉fixed没有固定住,怎么回事?
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