JSFiddle - React, Tailwind, and code Playground

by Mysterious

HTML

<div class="cover">
    <div class="block-cover">
        <h1>Заголовок</h1>
        <article>
            Содержимое
        </article>
    </div>
    
    <i class="opacity"></i>
</div>

CSS

body {
    background: url(http://naikom.ru/img/2011/folders/pattern/12.jpg) repeat 0 0;
}
.cover {
    margin: 20px;
    border: 2px solid #000;
    border-radius: 5px;
    background: none;
    position: relative;
}
.opacity {
    display: block;
    position: absolute;
    background: #000;
    opacity: 0.3;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 0;
}

.block-cover {
    margin: 7px;
}
h1 {
    border: 1px solid #000;
    border-bottom: none;
    border-radius: 5px 5px 0 0;
    padding: 10px 15px;    
    position: relative;
    
background: #ffd800;
background: url(data:image/svg+xml;base64,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);
background: -moz-linear-gradient(top,  #ffd800 0%, #ffbd00 100%);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#ffd800), color-stop(100%,#ffbd00));
background: -webkit-linear-gradient(top,  #ffd800 0%,#ffbd00 100%);
background: -o-linear-gradient(top,  #ffd800 0%,#ffbd00 100%);
background: -ms-linear-gradient(top,  #ffd800 0%,#ffbd00 100%);
background: linear-gradient(to bottom,  #ffd800 0%,#ffbd00 100%);
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffd800', endColorstr='#ffbd00',GradientType=0 );

}
h1:after {
    display: block;
    content: ' ';
    position: absolute;
    /*background: #FFBA00;*/
    height: 0;
    width: 0;
    top: 100%;
    left: auto;
   ...