JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper">
    <div class="content">my text</div>
</div>

CSS

.wrapper {
    height:400px;
    width:400px;
    position: relative;
}
.wrapper::before{
    width:100%;
    height:100%;
    position: absolute;
    background-image:url('https://i.imgur.com/iAgdW.jpg');
    background-size:cover;
    -webkit-filter: blur(4px);
    -moz-filter: blur(4px);
    -ms-filter: blur(4px);
    -o-filter: blur(4px);
    filter: blur(4px);
}
.content{
    position: absolute;
    background-color:red;
}