.powerful_code-main {
  max-width: 750px;
  margin: auto;
  box-shadow: 0 0 10px 10px #f5f5f5;
  min-height: 100vh;
}
html,body {
  font-size: 14px;
}
* {
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}