JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    
    <div class="opaque-white">
        Area with opaque (opacity: 0.95) background.
    </div>
    
</body>

CSS

body {
    background: white;
}

.opaque-white {
    background: #ffffff;
    opacity:.95;
    height: 300px;
    width: 300px;
}