JSFiddle - React, Tailwind, and code Playground

by moloko

HTML

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Центрированный блок</title>
  </head>
  <body>
    <div></div>
    <span>www.itmathrepetitor.ru</span>
    <hr>
  </body>
</html>

CSS

body {
  background-image: url(https://img-fotki.yandex.ru/get/67890/136164467.17/0_12bc81_21263ac1_orig.png)
}

div {
  border: 2px solid black;
  width: 200px;
  height: 100px;
  margin: 50px auto 150px;
}

span {
  color: blue;
}

hr {
  border: none;
  color: darkblue;
  background-color: darkblue;
  height: 1px;
}