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我有一個固定的標題，我設置了比正文內容更高的z-index，以便內容在其下滑動。爲了將content div定位在固定標題的正下方，我設置了其position:relative並給它一個top value在相對定位Div中移動空白
這似乎工作正常，直到我開始將項目添加到content div。首先，我添加了一個h1，因爲我試圖給它一點點margin-top整個頁面（標題和全部）向下移動了我爲我的margin-top指定的值。
我以前遇到過這個問題（崩潰的divs是？），我通常可以使用設置寬度或浮點數或顯示模塊來修復它，但這些似乎都沒有效果。
有人能告訴我我失蹤了什麼嗎？
*
{
padding: 0;
margin: 0;
}
header
{
background-color: white;
color: #724444;
width: 100%;
height: 90px;
border-bottom: 1px solid rgba(140, 140, 140, .2);
position: fixed;
font-family: 'Lato', sans-serif;
font-weight: bold;
font-size: 15px;
text-align: center;
line-height: 1.3;
z-index: 1000;
}
#header-fixedWidth
{
width: 1000px;
height: 90px;
margin: 0 auto;
display:flex;
align-items: center;
justify-content: space-between;
padding-left: 20px;
padding-right: 20px;
box-sizing: border-box;
}
nav ul
{
list-style: none;
display: flex;
}
nav ul li
{
margin: 0 10px;
}
#main-content
{
width: 100%;
min-height: 100px;
position: relative;
top: 89px;
}
#main-content-fixedWidth
{
width: 1000px;
min-height: 100px;
margin: 0 auto;
position: relative;
}
.headers
{
font-family: 'Lato', sans-serif;
font-weight: bold;
font-size: 30px;
line-height: 1.3;
margin-top: 20px;
}
#image-deck
{
width: 1000px;
border: 1px solid #ccc;
position: relative;
display: block;
}
/*Media Queries*/
@media (max-width: 1000px)
{
header
{
width: 100%;
}
#header-fixedWidth
{
width: 100%;
}
}<html>
<head>
<title>Pic Monkey Recreation</title>
<link rel="stylesheet" href="style.css" />
<meta name="viewport" content="width=device-width">
<link href="https://fonts.googleapis.com/css?family=Lato" rel="stylesheet" />
</head>
<body>
<header>
<div id="header-fixedWidth"
<img src="Images/logo.png" alt="randomLogo" id="randomLogo" />
<nav>
<ul>
<li>
<img src="Images/iconMenu/edit.png" alt="">
<br>
<p>Edit</p>
</li>
<li>
<img src="Images/iconMenu/touchUps.png" alt="">
<br>
<p>Touch Up</p>
</li>
<li>
<img src="Images/iconMenu/design.png" alt="">
<br>
<p>Design</p>
</li>
<li>
<img src="Images/iconMenu/collage.png" alt="">
<br>
<p>Collage</p>
</li>
</ul>
</nav>
<div id="user-help">
<img src="Images/signIn.png" alt="signIn" id="signIn" />
</div>
</div>
</header>
<div id="main-content">
<div id="main-content-fixedWidth">
<div id="test">
<p class="headers">Here is a header for you to look at</p>
</div>
<div id="image-deck"></div>
</div>
</div>
</body>
</html>