Не получается сделать все карточки сделать по центру,они слева.
<!DOCTYPE html>
<html lang="en">
<head>
<link rel="stylesheet" href="css/icon.css">
<link rel="stylesheet" href="css/material.indigo-pink.min.css">
<link rel="stylesheet" href="css/style.css">
<script defer src="js/material.min.js"></script>
<meta charset="UTF-8">
<title>Скачать альбомы</title>
</head>
<body>
<div class="demo-layout-transparent mdl-layout mdl-js-layout">
<header class="mdl-layout__header mdl-layout__header--transparent">
<div class="mdl-layout__header-row">
<!-- Title -->
<span class="mdl-layout-title">Downloader</span>
<!-- Add spacer, to align navigation to the right -->
<div class="mdl-layout-spacer"></div>
<!-- Navigation -->
<nav class="mdl-navigation">
<a class="mdl-navigation__link" href="/">Главная</a>
<a class="mdl-navigation__link" href="">Проекты</a>
<a class="mdl-navigation__link" href="">Link</a>
<a class="mdl-navigation__link" href="">Link</a>
</nav>
</div>
</header>
<main class="mdl-layout__content">
<div class="mdl-grid">
<!-- card -->
<div class="demo-card-wide mdl-card mdl-shadow--2dp">
<div class="mdl-card__title" style="background-image: url('img/albums.jpg')">
<h2 class="mdl-card__title-text">Альбомы</h2>
</div>
<div class="mdl-card__supporting-text">
<p>текст</p>
</div>
<div class="mdl-card__actions mdl-card--border">
<a class="mdl-button mdl-button--colored mdl-js-button mdl-js-ripple-effect">
Перейти
</a>
</div>
<div class="mdl-card__menu">
<button class="mdl-button mdl-button--icon mdl-js-button mdl-js-ripple-effect">
<i class="material-icons">share</i>
</button>
</div>
</div>
<!-- card end-->
