Set the margin-bottom of.content to negative

<! DOCTYPEhtml>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="Width = device - width, initial - scale = 1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Sticky Footer</title>
    <style>
      html.body {
        margin: 0;
        padding: 0;
        height: 100%;
        text-align: center;
      }

      .content {
        min-height: 100%;
        margin-bottom: -50px; /* is the inverse of the height of.footer */
      }

      .content-inside {
        background-color: #c2ffa9;
      }

      .push {
        height: 50px; /*.push is an extra placeholder element with the same height as.footer */
      }

      .footer {
        height: 50px;
        line-height: 50px; /* To center text vertically */
        background-color: #3ba4f9;
      }
    </style>
  </head>
  <body>
    <div class="content">
      <! -- div. Content-inside height can be set arbitrarily, and can be adjusted according to the content height -->
      <div class="content-inside">
        <! -- content -->
        <div>Content</div>
        <div>Content</div>
        <div>Content</div>
      </div>
      <! Div. Push is an extra placeholder element with the same height as div. Footer -->
      <div class="push"></div>
    </div>
    <div class="footer">Sticky Footer</div>
  </body>
</html>
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Set margin-top to negative for.footer

<! DOCTYPEhtml>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="Width = device - width, initial - scale = 1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Sticky Footer</title>
    <style>
      html.body {
        margin: 0;
        padding: 0;
        height: 100%;
        text-align: center;
      }

      .content {
        min-height: 100%;
      }

      .content-inside {
        background-color: #c2ffa9;
      }

      .footer {
        height: 50px;
        line-height: 50px; /* To center text vertically */
        background-color: #3ba4f9;
        margin-top: -50px; /* is the inverse of the height of.footer */
      }
    </style>
  </head>
  <body>
    <div class="content">
      <! -- div. Content-inside height can be set arbitrarily, and can be adjusted according to the content height -->
      <div class="content-inside">
        <! -- content -->
        <div>Content</div>
        <div>Content</div>
        <div>Content</div>
      </div>
    </div>
    <div class="footer">Sticky Footer</div>
  </body>
</html>
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Use calc() to set the height of.content

<! DOCTYPEhtml>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="Width = device - width, initial - scale = 1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Sticky Footer</title>
    <style>
      html.body {
        margin: 0;
        padding: 0;
        height: 100%;
        text-align: center;
      }

      .content {
        /* If there is a space between.content and.footer, subtract */
        min-height: calc(100vh - 50px);
      }

      .content-inside {
        background-color: #c2ffa9;
      }

      .footer {
        height: 50px;
        line-height: 50px; /* To center text vertically */
        background-color: #3ba4f9;
      }
    </style>
  </head>
  <body>
    <div class="content">
      <div class="content-inside">
        <! -- content -->
        <div>Content</div>
        <div>Content</div>
        <div>Content</div>
      </div>
    </div>
    <div class="footer">Sticky Footer</div>
  </body>
</html>
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Use Flexbox elastic layout

<! DOCTYPEhtml>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="Width = device - width, initial - scale = 1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Sticky Footer</title>
    <style>
      html.body {
        margin: 0;
        padding: 0;
        height: 100%;
        text-align: center;
      }

      body {
        min-height: 100%;
        display: flex;
        flex-direction: column;
      }

      .content {
        flex: 1;
      }

      .content-inside {
        background-color: #c2ffa9;
      }

      .footer {
        /* This scheme does not need to fix the height of.footer */
        background-color: #3ba4f9;
      }
    </style>
  </head>
  <body>
    <div class="content">
      <div class="content-inside">
        <! -- content -->
        <div>Content</div>
        <div>Content</div>
        <div>Content</div>
      </div>
    </div>
    <div class="footer">Sticky Footer</div>
  </body>
</html>

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Use Grid Grid layout

<! DOCTYPEhtml>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="Width = device - width, initial - scale = 1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Sticky Footer</title>
    <style>
      html.body {
        margin: 0;
        padding: 0;
        height: 100%;
        text-align: center;
      }

      body {
        min-height: 100%;
        display: grid;
        grid-template-rows: 1fr auto;
      }

      .content-inside {
        background-color: #c2ffa9;
      }

      .footer {
        grid-row-start: 2;
        grid-row-end: 3;
        background-color: #3ba4f9;
      }
    </style>
  </head>
  <body>
    <div class="content">
      <div class="content-inside">
        <! -- content -->
        <div>Content</div>
        <div>Content</div>
        <div>Content</div>
      </div>
    </div>
    <div class="footer">Sticky Footer</div>
  </body>
</html>
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