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少ないコンテンツでもフッターはスクリーンの一番下に表示する簡単なやり方CSS Flex

Posted at 2019-11-12

HTML


<body class="Site">
  <header class="Site-header">ヘッダー</header>
  <main class="Site-content">少ない中身</main>
  <footer class="Site-footer">Footer</footer>
</body>

CSS

.Site {
  display: flex;
  min-height: 100vh;  /*ビューポートの高さに対する割合100*/
  flex-direction: column;
}

.Site-header,
.Site-footer {
  flex: none; 
  background-color: #99cc00;
}

.Site-content {
  flex: 1 0 auto;  /*flex: flex-grow flex-shrink flex-basis|auto|initial|inherit; shrinkしないように*/
  padding: var(--space) var(--space) 0;
  width: 100%;
  background-color: #666666;
}
.Site-content::after {
  content: '\00a0'; /* &nbsp; */
  display: block;
  margin-top: var(--space);
  height: 0px;
  visibility: hidden;
}
@media (--break-lg) {
  .Site-content {
    padding-top: var(--space-lg);
  }
  .Site-content::after {
    margin-top: var(--space-lg);
  }
}

.Site-content--full {
  padding: 0;
}
.Site-content--full::after {
  content: none;
}

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