CSS 带旋转、重复和不透明度的背景图片

Question

我正在尝试用图像制作漂亮的背景，但我希望图像重复填充屏幕，不透明度设置为 0.5 并旋转 45 度。我已经尝试了很多事情来完成这个但是没有运气。有人有什么想法吗？

在此 Codepen 中，我将图像旋转且不透明，但无法使背景重复工作。

.background {
  height: 500px;
  width: 500px;
  position: relative;
  display: inline-block;
  padding: 100px;
  border: black 3px solid;
}

.background::before {
  content: "";
  position: absolute;
  overflow: hidden;
  width: 100px;
  height: 100px;
  left: 0;
  top: 0;
  z-index: -1;
  opacity: 0.5;
  background: url(https://cambridgewords.files.wordpress.com/2019/11/funny.jpg);
  background-size: contain;
  transform: rotate(45deg);
  background-repeat: repeat;
  opacity: 0.5;
}

<span class='background'>HElloWorld</span>

Answer 1

尝试增加 ::before 伪元素的大小，然后像这样减小背景大小：

.background::before {
    content: "";
    position: absolute;
    overflow: hidden;
    width: 100%; /* made width 100% */
    height: 100%; /* made height 100% */
    left: 0;
    top: 0;
    z-index: -1;
    opacity: 0.5;
    background: url(https://cambridgewords.files.wordpress.com/2019/11/funny.jpg);
    background-size: 100px; /* made background size smaller */
    transform: rotate(45deg);
    background-repeat: repeat;
    opacity: 0.5;
}

这只是使背景伪元素成为元素的完整大小，然后使背景变小并重复。希望对您有所帮助。

Answer 2

您可以像下面这样操作：

.background {
  height: 500px;
  width: 500px;
  position: relative;
  z-index:0;
  display: inline-block;
  overflow:hidden; /* hide the overflow here not on the pseudo element */
  padding: 100px;
  border: black 3px solid;
}

.background::before {
  content: "";
  position: absolute;
  z-index: -1;
  /* 141% ~ sqrt(2)x100% to make sure to cover all the area after the rotation */
  width: 141%;
  height:141%;
  /**/
  /* to center*/
  left: 50%;
  top: 50%;
  /* */
  background: url(https://cambridgewords.files.wordpress.com/2019/11/funny.jpg);
  background-size: 100px 100px; /* size of the image*/
  transform:translate(-50%,-50%) rotate(45deg); /* center the element then rotate */
  opacity: 0.5;
}

<span class='background'>
    HElloWorld
  </span>

CSS 带旋转、重复和不透明度的背景图片

CSS background image w/ rotate, repeat and opacity

html

css

background-image