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<style>.demo_test {
width: 400px;
height: 300px;
}
.glassmorphism {
background: rgba(255, 255, 255, 0.25);
backdrop-filter: blur(4px);
-webkit-backdrop-filter: blur(4px);
border-radius: 10px;
border: 1px solid #ffffff;
</style>
<div class="demo_test glassmorphism"></div>