CSS

Question

我还在学习，完全不知道是什么原因造成的。 header 有一个固定的位置，但是当我滚动页面时，header 不在顶部并且被一些 div 覆盖。

#header {
  display: flex;
  width: 70vw;
  height: 150px;
  position: fixed;
  left: 50%;
  transform: translate(-50%, 0);
  border: solid 2px #f48d26;
  border-radius: 5px;
  margin: auto;
  justify-content: space-around;
  background-color: white;
}
#center {
  width: 70vw;
  display: flex;
  flex-direction: column;
  text-align: center;
  border: solid 2px #f48d26;
  border-radius: 5px;
  margin: 165px auto 0;
  font-family: Orator Std; 
  background-color: white;
}
#center-pics {
  display: flex;
  justify-content: space-between;
  margin: 40px 100px 20px ;
}
.picture {
  width: 16vw;
  height: 12vw;
  color: black;
  opacity: 0.85;
  border: solid 1px grey;
  border-radius: 5px;
  margin: 30px 0 0 0;
}

<div id="header">
    <img id="header-img" src="https://i.postimg.cc/q7PLWG9j/banner-bez-tla.jpg" alt="company banner with pet faces">
  <nav>
   <ul id="nav-bar">
     <li><a class="nav-link" href="#center">FEATURES</a></li>
     <li><a class="nav-link" href="#quotes">QUOTES</a></li>
   </ul>
  </nav>
  </div>
  <div id="center">
    <div id="center-pics">
      <div class="picture" id="pic1"><p>High quality materials and products</p></div>
      <div class="picture" id="pic2"><p>Tailored for your pet needs</p></div>
      <div class="picture" id="pic3"><p>Pet, human and eco-friendly</p></div>
    </div>
  </div>

有人可以帮忙吗？谢谢！

Answer 1

position:absolute

很可能会修复 IMG 覆盖

Answer 2

你的问题的答案很简单。您需要做的就是将 z-index: 100; 样式属性添加到您的 header 以防止它位于其他元素之下。

#header {
display: flex;
width: 70vw;
height: 150px;
position: fixed;
left: 50%;
transform: translate(-50%, 0);
border: solid 2px #f48d26;
border-radius: 5px;
margin: auto;
justify-content: space-around;
background-color: white;
z-index: 100;
}

Answer 3

您应该提供比其他 div 元素更高的 z-index 以使某些元素位于其他元素之上。

https://codepen.io/joonahn/pen/BaYjqvK

#header {
  display: flex;
  width: 70vw;
  height: 150px;
  position: fixed;
  left: 50%;
  transform: translate(-50%, 0);
  border: solid 2px #f48d26;
  border-radius: 5px;
  margin: auto;
  justify-content: space-around;
  background-color: white;
  z-index:1000; /* this */
}

CSS - 修复了 header 在滚动时被其他 div 覆盖的问题

CSS - fixed header gets covered by other divs when scrolling

header

fixed