背景噪点

by jkhaoqi110

HTML

<div class="container"></div>

CSS

.container {
    background: #5c1f8d;
    padding: 1rem;
    border-radius: 0.5rem;
    display: flex;
    position: relative;
    width: 300px;
    height: 200px;
    margin: 0 auto 2em;
    box-shadow: none;
    transition: all .2s ease;
    overflow: hidden;
}
.container:before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 2;
    filter: brightness(80%) contrast(100%);
    mix-blend-mode: overlay;
    background-size: cover;
    background-image: radial-gradient(circle at 50% 40%,rgba(0,0,0,0),rgba(0,0,0,.25)),url("data:image/svg+xml,%3Csvg viewBox='0 0 10000 10000' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='1' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}