Edit fiddle - JSFiddle - React, Tailwind, and code Playground

JSFiddle - React, Tailwind, and code Playground

HTML

<div class="small">Заголовок Заголовок2</div>
<div class="big">
<div class="gg"></div>
Содержание блока<br><br><br><br></div>

CSS

div {margin:0;}
.small, .big {border:1px solid #050; background:#AEA; padding:5px; box-shadow: 0 0 3px 1px #151; position:relative;}
.small {border-radius:10px 10px 0 0; font-weight:bold; font-size:1.2em; display:inline-block; border-bottom-width:0; margin-bottom:-1px;z-index:1;}
.big {border-radius:0 0 10px 10px;}
.gg {position:absolute; left:0; margin-top:-5px; background:#AEA; height:5px; width:100%;z-index:2;}

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JSFiddle - React, Tailwind, and code Playground

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CSS

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