你可以使用svg背景。你不能在背景中添加css过滤器。你也可以使用伪元素来代替背景。
超文本标记语言

<div class="module">
  <div class="module-inside">
    Module
  </div>
</div>

CSS

body {
  height: 100vh;
  padding: 0;
  display: grid;
  align-content: center;
  justify-content: center;
}
.module {
  width: 300px;
  height: 300px;
  display: grid;
  place-items: center;
  color: #ff43ea;
  position: relative;
}
.module::before {
  content: "";
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  position: absolute;
  background-image: url(https://images.unsplash.com/photo-1494645009625-cc17363a5f20?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ&s=bd502af39c922553e5a13624d4f44f40);
  background-size: cover;
  filter: blur(4px);
}
.module-inside {
  position: relative;
  font: bold 42px sans-serif;
}