JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    <div class="blackbalk">Text</div>
</body>

CSS

body {
    background: red;
}
.blackbalk{
    background:black;
    ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=85)";
    filter:alpha(opacity=85); 
    -khtml-opacity:.85; 
    -moz-opacity:.85; 
    opacity:.85; 
    width: 985px;
    margin: 0 auto;
    height:255px;
    color: white;
}