html - 底部 div 重叠

Question

我们正在尝试创建电子邮件应用程序。我们在邮件正文 div 中遇到问题，它与 header div(包含 To/CC/Subject)重叠。在页面加载时，一切看起来都不错，但是当开始在“收件人”字段中添加电子邮件 ID 时，正文部分与标题重叠。

.MainDiv{
position: fixed;
    width: 65%;
    max-width: 890px;
    height: 80%;
    max-height: 1100px;
    z-index: 1000 !important;
    padding: 0px 0px 0px;
    top: 10%;
    left: 23%;
    right: auto;
    bottom: auto;
}

.Header{
    clear: both;
    margin: 0 5px 25px;
    min-height: 100px;
    display: block;
    position: absolute;
    width: 99%;
    border: solid 1px green;
    padding: 10px 20px 0px;
    overflow: initial !important;{
}

.Body{
    position: absolute;
    border: solid 1px red;
    top: 175px;
    bottom: 72px;
    width: 100%;
    overflow-y: auto;
}

ReplyMessage_Screenshot

Answer 1

删除 position: absolute; 它导致了问题

.MainDiv{
position: relative;
    width: 65%;
    max-width: 890px;
    height: 100%;
    max-height: 1100px;
    z-index: 1000 !important;
    padding: 0px 0px 0px;
    top: 10%;
    left: 23%;
    right: auto;
    bottom: auto;
    border: solid 1px black;
    overflow-y : auto;
}

.Header{
    clear: both;
    
    min-height: 100px;
    display: block;
    width: 100%;
    border: solid 1px green;    
    overflow: initial !important;
}

.Body{
    border: solid 1px red;
    width: 100%;
    overflow-y: auto;
}
h2{
  background-color:yellow;
}
h3{
  background-color:teal;
}

<div class = "MainDiv"  >

<div class ="Header" contenteditable="true">
<h2>
Header  ygygyggyggygyyygyggygyyg yyfyffyyffyfyfy yfyfyfyfy gygygygygyyg yggygygyyggy gygyygygyyggygygygygy yggyygygyggyy uhuuuguug guuggugu
</h2>
</div>
<div class= "Body" contenteditable="true">
<h3>
Message Body
</h3>
</div>
</div>