Center div horizontally without width

Wrapper div align center without assign margin or width

by Krupal Patel

HTML

<div class="main_section">
  <div class="content_wrapper">
    <div class="container">Div align center without fix width</div>
  </div>
</div>

CSS

body {
  padding: 200px 0 0 0;
  margin: 0;
}

.main_section {
  float: right;
  position: relative;
  right: 50%;
  z-index: 999;
}

.content_wrapper {
  float: right;
  position: relative;
  right: -50%;
}

.container {
  color: #333;
  background: #f5f5f5;
  border: 5px #ccc solid;
  padding: 10px;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 20px;
  letter-spacing: 1px;
  max-width: 50%;
  box-shadow: -1px -1px 5px 1px #666666;
}