CSS : center form in page horizontally and vertically

Question

How can i center the form called form_login horizontally and vertically in my page ?

Here is the HTML I\'m using right now:

Answer 1

How about using a grid? it's 2019 and support is reasonable

body {
  margin: 0;
  padding: 0;
  background-color: red;
}

.content {
  display: grid;
  background-color: bisque;
  height: 100vh;
  place-items: center;
}

  
    

      
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