如何将 CSS 卡片放在背景图片上

How to put CSS card over background image

我正在为这张 CSS 卡而苦苦挣扎,我想把它放在背景图片上,但我不知道怎么做,我已经尝试过定位 我不小心把背景图片放在了header,我把它改成了div,还是不行 有人可以帮忙吗?

* {
  margin: 0;
  padding: 0;
  font-family: 'Century Gothic';
}

img {
  width: 100%;
}

.header {
  background-image: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url(images/foto_beginpagina.jpg);
  height: 100vh;
  background-size: cover;
  background-position: center;
}

ul {
  float: right;
  list-style-type: none;
  margin-top: 25px;
}

ul li {
  display: inline-block;
}

ul li a {
  text-decoration: none;
  color: white;
  padding: 5px 20px;
  border: 1px solid white;
  transition: 0.6s ease;
}

ul li.huidig a {
  background-color: white;
  color: black;
}

ul li a:hover {
  background-color: white;
  color: black;
}

.head {
  margin-right: 25px;
}

.titel {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.titel h1 {
  color: white;
  font-size: 70px;
}

div.ondertitel h3 {
  color: white;
  padding-top: 20px;
  max-width: 600px;
  left: 50%;
}

.card {
  position: absolute;
  margin: 30px;
  padding: 10px;
  background: rgb(139, 119, 167);
  background: radial-gradient(circle, rgba(139, 119, 167, 1) 0%, rgba(139, 122, 140, 1) 100%);
  min-width: 400px;
  max-width: 400px;
  border: 2px solid black;
}

.card-title {
  padding: 30px;
}

.card-image img {
  border-radius: 20%;
}
<html>

<body>
  <div class="header">
    <div class="head">
      <ul>
        <li><a href="index.html">Home</a></li>
        <li><a href="geschiedenis.html">Geschiedenis</a></li>
        <li class="huidig"><a href="rand.html">Randapparatuur</a></li>
        <li><a href="opbouw.html">Opbouw van de computer</a></li>
      </ul>
    </div>
  </div>
  <div class="card">
    <div class="card-image">
      <img src="images/randapparatuur.jpg" alt="Randapparatuur">
    </div>
    <h1 class="card-title">Randapparatuur</h1>
    <p class="card-text">Lorem ipsum dolor sit amet, consectetur adipiscing elit. In facilisis tortor id erat pellentesque sodales. Nulla ut pharetra lacus, nec facilisis tortor. Morbi egestas, erat a tempus finibus, lectus sapien condimentum odio, ut pretium arcu magna sed
      leo. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia curae; Sed id placerat orci, vitae laoreet sem. Praesent nulla lacus, interdum quis maximus at, ultricies laoreet orci. Praesent tempus eros ac fringilla aliquam.
      Fusce pharetra, mi eget aliquam vulputate, massa justo mattis arcu, in dictum quam libero a elit. Aliquam erat volutpat. Fusce vestibulum tincidunt commodo. Duis non mattis nisl, non condimentum tellus. Sed commodo aliquet augue vel tincidunt. Nunc
      eleifend nisi scelerisque odio fringilla, vel aliquet nisl imperdiet. Nulla ligula justo, sollicitudin a mollis non, viverra id odio. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.
    </p>
  </div>
</body>

</html>

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Class .cardposition: absolute 导致问题。

添加了 .main-content div 和背景图片封面。

示例https://codepen.io/cursorrux/pen/LYRjQqG

这可能对您有帮助:

* {
    margin: 0;
    padding: 0;
    font-family: 'Century Gothic';
}
img {
    width: 100%;
}
.header {
    background-image:linear-gradient(rgba(0,0,0,0.5),rgba(0,0,0,0.5)), url('images/foto_beginpagina.jpg');
    height: 50vh;
    background-size: cover;
    background-position: center;
}
ul {
    float: right;
    list-style-type: none;
    margin-top: 25px;
}
ul li {
    display: inline-flex;
}
ul li a {
    text-decoration: none;
    color: white;
    padding: 5px 20px;
    border: 1px solid white;
    transition: 0.6s ease;
}
ul li.huidig a {
    background-color: white;
    color: black;
}
ul li a:hover {
    background-color: white;
    color: black;
}
.head {
    margin-right: 25px;
}
.titel{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
}
.titel h1{
    color: white;
    font-size: 70px;
}
div.ondertitel h3{
    color: white;
    padding-top: 20px;
    max-width: 600px;
    left: 50%;
}

/* div having background image */
.main-content {
  background-image: url('https://murraysinteriors.com.au/wp-content/uploads/2018/09/dummy-banner.jpg');
  padding: 5px;
  background-size: cover;
}
.card{
    margin: 30px;
    padding: 10px;
    background: rgb(139,119,167);
    background: radial-gradient(circle, rgba(139,119,167,1) 0%, rgba(139,122,140,1) 100%);
    min-width: 400px;
    max-width: 400px;
    border: 2px solid black;
}
.card-title {
    padding: 30px;
}
.card-image img {
    border-radius: 20%;
}
<div class="header">
    <div class="head">
        <ul>
            <li><a href="index.html">Home</a></li>
            <li><a href="geschiedenis.html">Geschiedenis</a></li>
            <li class="huidig"><a href="rand.html">Randapparatuur</a></li>
            <li><a href="opbouw.html">Opbouw van de computer</a></li>
        </ul>
    </div>
</div>
<div class="main-content">
  <div class="card">
    <div class="card-image">
      <img src="https://pixselo.com/wp-content/uploads/2018/03/dummy-placeholder-image-400x400.jpg" alt="Randapparatuur">
    </div>
    <h1 class="card-title">Randapparatuur</h1>
    <p class="card-text">Lorem ipsum dolor sit amet, consectetur adipiscing elit. In facilisis tortor id erat pellentesque sodales. Nulla ut pharetra lacus, nec facilisis tortor. Morbi egestas, erat a tempus finibus, lectus sapien condimentum odio, ut pretium arcu magna sed leo. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia curae; Sed id placerat orci, vitae laoreet sem. Praesent nulla lacus, interdum quis maximus at, ultricies laoreet orci. Praesent tempus eros ac fringilla aliquam. Fusce pharetra, mi eget aliquam vulputate, massa justo mattis arcu, in dictum quam libero a elit. Aliquam erat volutpat. Fusce vestibulum tincidunt commodo. Duis non mattis nisl, non condimentum tellus. Sed commodo aliquet augue vel tincidunt. Nunc eleifend nisi scelerisque odio fringilla, vel aliquet nisl imperdiet. Nulla ligula justo, sollicitudin a mollis non, viverra id odio. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.
    </p>
  </div> 
</div>